A prefix of a string S is any leading contiguous part of S. For example, "c" and "cod" are prefixes of the string "codility". For simplicity, we require prefixes to be non-empty.
The product of prefix P of string S is the number of occurrences of P multiplied by the length of P. More precisely, if prefix P consists of K characters and P occurs exactly T times in S, then the product equals K * T.
For example, S = "abababa" has the following prefixes:
- "a", whose product equals 1 * 4 = 4,
- "ab", whose product equals 2 * 3 = 6,
- "aba", whose product equals 3 * 3 = 9,
- "abab", whose product equals 4 * 2 = 8,
- "ababa", whose product equals 5 * 2 = 10,
- "ababab", whose product equals 6 * 1 = 6,
- "abababa", whose product equals 7 * 1 = 7.
The longest prefix is identical to the original string. The goal is to choose such a prefix as maximizes the value of the product. In above example the maximal product is 10.
In this problem we consider only strings that consist of lower-case English letters (a−z).
Write a function
int solution(char *S);
that, given a string S consisting of N characters, returns the maximal product of any prefix of the given string. If the product is greater than 1,000,000,000 the function should return 1,000,000,000.
For example, for a string:
- S = "abababa" the function should return 10, as explained above,
- S = "aaa" the function should return 4, as the product of the prefix "aa" is maximal.
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [1..300,000];
- string S is made only of lowercase letters (a−z).
Copyright 2009–2025 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
A prefix of a string S is any leading contiguous part of S. For example, "c" and "cod" are prefixes of the string "codility". For simplicity, we require prefixes to be non-empty.
The product of prefix P of string S is the number of occurrences of P multiplied by the length of P. More precisely, if prefix P consists of K characters and P occurs exactly T times in S, then the product equals K * T.
For example, S = "abababa" has the following prefixes:
- "a", whose product equals 1 * 4 = 4,
- "ab", whose product equals 2 * 3 = 6,
- "aba", whose product equals 3 * 3 = 9,
- "abab", whose product equals 4 * 2 = 8,
- "ababa", whose product equals 5 * 2 = 10,
- "ababab", whose product equals 6 * 1 = 6,
- "abababa", whose product equals 7 * 1 = 7.
The longest prefix is identical to the original string. The goal is to choose such a prefix as maximizes the value of the product. In above example the maximal product is 10.
In this problem we consider only strings that consist of lower-case English letters (a−z).
Write a function
int solution(string &S);
that, given a string S consisting of N characters, returns the maximal product of any prefix of the given string. If the product is greater than 1,000,000,000 the function should return 1,000,000,000.
For example, for a string:
- S = "abababa" the function should return 10, as explained above,
- S = "aaa" the function should return 4, as the product of the prefix "aa" is maximal.
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [1..300,000];
- string S is made only of lowercase letters (a−z).
Copyright 2009–2025 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
A prefix of a string S is any leading contiguous part of S. For example, "c" and "cod" are prefixes of the string "codility". For simplicity, we require prefixes to be non-empty.
The product of prefix P of string S is the number of occurrences of P multiplied by the length of P. More precisely, if prefix P consists of K characters and P occurs exactly T times in S, then the product equals K * T.
For example, S = "abababa" has the following prefixes:
- "a", whose product equals 1 * 4 = 4,
- "ab", whose product equals 2 * 3 = 6,
- "aba", whose product equals 3 * 3 = 9,
- "abab", whose product equals 4 * 2 = 8,
- "ababa", whose product equals 5 * 2 = 10,
- "ababab", whose product equals 6 * 1 = 6,
- "abababa", whose product equals 7 * 1 = 7.
The longest prefix is identical to the original string. The goal is to choose such a prefix as maximizes the value of the product. In above example the maximal product is 10.
In this problem we consider only strings that consist of lower-case English letters (a−z).
Write a function
class Solution { public int solution(string S); }
that, given a string S consisting of N characters, returns the maximal product of any prefix of the given string. If the product is greater than 1,000,000,000 the function should return 1,000,000,000.
For example, for a string:
- S = "abababa" the function should return 10, as explained above,
- S = "aaa" the function should return 4, as the product of the prefix "aa" is maximal.
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [1..300,000];
- string S is made only of lowercase letters (a−z).
Copyright 2009–2025 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
A prefix of a string S is any leading contiguous part of S. For example, "c" and "cod" are prefixes of the string "codility". For simplicity, we require prefixes to be non-empty.
The product of prefix P of string S is the number of occurrences of P multiplied by the length of P. More precisely, if prefix P consists of K characters and P occurs exactly T times in S, then the product equals K * T.
For example, S = "abababa" has the following prefixes:
- "a", whose product equals 1 * 4 = 4,
- "ab", whose product equals 2 * 3 = 6,
- "aba", whose product equals 3 * 3 = 9,
- "abab", whose product equals 4 * 2 = 8,
- "ababa", whose product equals 5 * 2 = 10,
- "ababab", whose product equals 6 * 1 = 6,
- "abababa", whose product equals 7 * 1 = 7.
The longest prefix is identical to the original string. The goal is to choose such a prefix as maximizes the value of the product. In above example the maximal product is 10.
In this problem we consider only strings that consist of lower-case English letters (a−z).
Write a function
int solution(String S);
that, given a string S consisting of N characters, returns the maximal product of any prefix of the given string. If the product is greater than 1,000,000,000 the function should return 1,000,000,000.
For example, for a string:
- S = "abababa" the function should return 10, as explained above,
- S = "aaa" the function should return 4, as the product of the prefix "aa" is maximal.
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [1..300,000];
- string S is made only of lowercase letters (a−z).
Copyright 2009–2025 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
A prefix of a string S is any leading contiguous part of S. For example, "c" and "cod" are prefixes of the string "codility". For simplicity, we require prefixes to be non-empty.
The product of prefix P of string S is the number of occurrences of P multiplied by the length of P. More precisely, if prefix P consists of K characters and P occurs exactly T times in S, then the product equals K * T.
For example, S = "abababa" has the following prefixes:
- "a", whose product equals 1 * 4 = 4,
- "ab", whose product equals 2 * 3 = 6,
- "aba", whose product equals 3 * 3 = 9,
- "abab", whose product equals 4 * 2 = 8,
- "ababa", whose product equals 5 * 2 = 10,
- "ababab", whose product equals 6 * 1 = 6,
- "abababa", whose product equals 7 * 1 = 7.
The longest prefix is identical to the original string. The goal is to choose such a prefix as maximizes the value of the product. In above example the maximal product is 10.
In this problem we consider only strings that consist of lower-case English letters (a−z).
Write a function
func Solution(S string) int
that, given a string S consisting of N characters, returns the maximal product of any prefix of the given string. If the product is greater than 1,000,000,000 the function should return 1,000,000,000.
For example, for a string:
- S = "abababa" the function should return 10, as explained above,
- S = "aaa" the function should return 4, as the product of the prefix "aa" is maximal.
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [1..300,000];
- string S is made only of lowercase letters (a−z).
Copyright 2009–2025 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
A prefix of a string S is any leading contiguous part of S. For example, "c" and "cod" are prefixes of the string "codility". For simplicity, we require prefixes to be non-empty.
The product of prefix P of string S is the number of occurrences of P multiplied by the length of P. More precisely, if prefix P consists of K characters and P occurs exactly T times in S, then the product equals K * T.
For example, S = "abababa" has the following prefixes:
- "a", whose product equals 1 * 4 = 4,
- "ab", whose product equals 2 * 3 = 6,
- "aba", whose product equals 3 * 3 = 9,
- "abab", whose product equals 4 * 2 = 8,
- "ababa", whose product equals 5 * 2 = 10,
- "ababab", whose product equals 6 * 1 = 6,
- "abababa", whose product equals 7 * 1 = 7.
The longest prefix is identical to the original string. The goal is to choose such a prefix as maximizes the value of the product. In above example the maximal product is 10.
In this problem we consider only strings that consist of lower-case English letters (a−z).
Write a function
class Solution { public int solution(String S); }
that, given a string S consisting of N characters, returns the maximal product of any prefix of the given string. If the product is greater than 1,000,000,000 the function should return 1,000,000,000.
For example, for a string:
- S = "abababa" the function should return 10, as explained above,
- S = "aaa" the function should return 4, as the product of the prefix "aa" is maximal.
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [1..300,000];
- string S is made only of lowercase letters (a−z).
Copyright 2009–2025 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
A prefix of a string S is any leading contiguous part of S. For example, "c" and "cod" are prefixes of the string "codility". For simplicity, we require prefixes to be non-empty.
The product of prefix P of string S is the number of occurrences of P multiplied by the length of P. More precisely, if prefix P consists of K characters and P occurs exactly T times in S, then the product equals K * T.
For example, S = "abababa" has the following prefixes:
- "a", whose product equals 1 * 4 = 4,
- "ab", whose product equals 2 * 3 = 6,
- "aba", whose product equals 3 * 3 = 9,
- "abab", whose product equals 4 * 2 = 8,
- "ababa", whose product equals 5 * 2 = 10,
- "ababab", whose product equals 6 * 1 = 6,
- "abababa", whose product equals 7 * 1 = 7.
The longest prefix is identical to the original string. The goal is to choose such a prefix as maximizes the value of the product. In above example the maximal product is 10.
In this problem we consider only strings that consist of lower-case English letters (a−z).
Write a function
class Solution { public int solution(String S); }
that, given a string S consisting of N characters, returns the maximal product of any prefix of the given string. If the product is greater than 1,000,000,000 the function should return 1,000,000,000.
For example, for a string:
- S = "abababa" the function should return 10, as explained above,
- S = "aaa" the function should return 4, as the product of the prefix "aa" is maximal.
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [1..300,000];
- string S is made only of lowercase letters (a−z).
Copyright 2009–2025 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
A prefix of a string S is any leading contiguous part of S. For example, "c" and "cod" are prefixes of the string "codility". For simplicity, we require prefixes to be non-empty.
The product of prefix P of string S is the number of occurrences of P multiplied by the length of P. More precisely, if prefix P consists of K characters and P occurs exactly T times in S, then the product equals K * T.
For example, S = "abababa" has the following prefixes:
- "a", whose product equals 1 * 4 = 4,
- "ab", whose product equals 2 * 3 = 6,
- "aba", whose product equals 3 * 3 = 9,
- "abab", whose product equals 4 * 2 = 8,
- "ababa", whose product equals 5 * 2 = 10,
- "ababab", whose product equals 6 * 1 = 6,
- "abababa", whose product equals 7 * 1 = 7.
The longest prefix is identical to the original string. The goal is to choose such a prefix as maximizes the value of the product. In above example the maximal product is 10.
In this problem we consider only strings that consist of lower-case English letters (a−z).
Write a function
function solution(S);
that, given a string S consisting of N characters, returns the maximal product of any prefix of the given string. If the product is greater than 1,000,000,000 the function should return 1,000,000,000.
For example, for a string:
- S = "abababa" the function should return 10, as explained above,
- S = "aaa" the function should return 4, as the product of the prefix "aa" is maximal.
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [1..300,000];
- string S is made only of lowercase letters (a−z).
Copyright 2009–2025 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
A prefix of a string S is any leading contiguous part of S. For example, "c" and "cod" are prefixes of the string "codility". For simplicity, we require prefixes to be non-empty.
The product of prefix P of string S is the number of occurrences of P multiplied by the length of P. More precisely, if prefix P consists of K characters and P occurs exactly T times in S, then the product equals K * T.
For example, S = "abababa" has the following prefixes:
- "a", whose product equals 1 * 4 = 4,
- "ab", whose product equals 2 * 3 = 6,
- "aba", whose product equals 3 * 3 = 9,
- "abab", whose product equals 4 * 2 = 8,
- "ababa", whose product equals 5 * 2 = 10,
- "ababab", whose product equals 6 * 1 = 6,
- "abababa", whose product equals 7 * 1 = 7.
The longest prefix is identical to the original string. The goal is to choose such a prefix as maximizes the value of the product. In above example the maximal product is 10.
In this problem we consider only strings that consist of lower-case English letters (a−z).
Write a function
fun solution(S: String): Int
that, given a string S consisting of N characters, returns the maximal product of any prefix of the given string. If the product is greater than 1,000,000,000 the function should return 1,000,000,000.
For example, for a string:
- S = "abababa" the function should return 10, as explained above,
- S = "aaa" the function should return 4, as the product of the prefix "aa" is maximal.
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [1..300,000];
- string S is made only of lowercase letters (a−z).
Copyright 2009–2025 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
A prefix of a string S is any leading contiguous part of S. For example, "c" and "cod" are prefixes of the string "codility". For simplicity, we require prefixes to be non-empty.
The product of prefix P of string S is the number of occurrences of P multiplied by the length of P. More precisely, if prefix P consists of K characters and P occurs exactly T times in S, then the product equals K * T.
For example, S = "abababa" has the following prefixes:
- "a", whose product equals 1 * 4 = 4,
- "ab", whose product equals 2 * 3 = 6,
- "aba", whose product equals 3 * 3 = 9,
- "abab", whose product equals 4 * 2 = 8,
- "ababa", whose product equals 5 * 2 = 10,
- "ababab", whose product equals 6 * 1 = 6,
- "abababa", whose product equals 7 * 1 = 7.
The longest prefix is identical to the original string. The goal is to choose such a prefix as maximizes the value of the product. In above example the maximal product is 10.
In this problem we consider only strings that consist of lower-case English letters (a−z).
Write a function
function solution(S)
that, given a string S consisting of N characters, returns the maximal product of any prefix of the given string. If the product is greater than 1,000,000,000 the function should return 1,000,000,000.
For example, for a string:
- S = "abababa" the function should return 10, as explained above,
- S = "aaa" the function should return 4, as the product of the prefix "aa" is maximal.
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [1..300,000];
- string S is made only of lowercase letters (a−z).
Copyright 2009–2025 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
A prefix of a string S is any leading contiguous part of S. For example, "c" and "cod" are prefixes of the string "codility". For simplicity, we require prefixes to be non-empty.
The product of prefix P of string S is the number of occurrences of P multiplied by the length of P. More precisely, if prefix P consists of K characters and P occurs exactly T times in S, then the product equals K * T.
For example, S = "abababa" has the following prefixes:
- "a", whose product equals 1 * 4 = 4,
- "ab", whose product equals 2 * 3 = 6,
- "aba", whose product equals 3 * 3 = 9,
- "abab", whose product equals 4 * 2 = 8,
- "ababa", whose product equals 5 * 2 = 10,
- "ababab", whose product equals 6 * 1 = 6,
- "abababa", whose product equals 7 * 1 = 7.
The longest prefix is identical to the original string. The goal is to choose such a prefix as maximizes the value of the product. In above example the maximal product is 10.
In this problem we consider only strings that consist of lower-case English letters (a−z).
Write a function
int solution(NSString *S);
that, given a string S consisting of N characters, returns the maximal product of any prefix of the given string. If the product is greater than 1,000,000,000 the function should return 1,000,000,000.
For example, for a string:
- S = "abababa" the function should return 10, as explained above,
- S = "aaa" the function should return 4, as the product of the prefix "aa" is maximal.
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [1..300,000];
- string S is made only of lowercase letters (a−z).
Copyright 2009–2025 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
A prefix of a string S is any leading contiguous part of S. For example, "c" and "cod" are prefixes of the string "codility". For simplicity, we require prefixes to be non-empty.
The product of prefix P of string S is the number of occurrences of P multiplied by the length of P. More precisely, if prefix P consists of K characters and P occurs exactly T times in S, then the product equals K * T.
For example, S = "abababa" has the following prefixes:
- "a", whose product equals 1 * 4 = 4,
- "ab", whose product equals 2 * 3 = 6,
- "aba", whose product equals 3 * 3 = 9,
- "abab", whose product equals 4 * 2 = 8,
- "ababa", whose product equals 5 * 2 = 10,
- "ababab", whose product equals 6 * 1 = 6,
- "abababa", whose product equals 7 * 1 = 7.
The longest prefix is identical to the original string. The goal is to choose such a prefix as maximizes the value of the product. In above example the maximal product is 10.
In this problem we consider only strings that consist of lower-case English letters (a−z).
Write a function
function solution(S: PChar): longint;
that, given a string S consisting of N characters, returns the maximal product of any prefix of the given string. If the product is greater than 1,000,000,000 the function should return 1,000,000,000.
For example, for a string:
- S = "abababa" the function should return 10, as explained above,
- S = "aaa" the function should return 4, as the product of the prefix "aa" is maximal.
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [1..300,000];
- string S is made only of lowercase letters (a−z).
Copyright 2009–2025 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
A prefix of a string S is any leading contiguous part of S. For example, "c" and "cod" are prefixes of the string "codility". For simplicity, we require prefixes to be non-empty.
The product of prefix P of string S is the number of occurrences of P multiplied by the length of P. More precisely, if prefix P consists of K characters and P occurs exactly T times in S, then the product equals K * T.
For example, S = "abababa" has the following prefixes:
- "a", whose product equals 1 * 4 = 4,
- "ab", whose product equals 2 * 3 = 6,
- "aba", whose product equals 3 * 3 = 9,
- "abab", whose product equals 4 * 2 = 8,
- "ababa", whose product equals 5 * 2 = 10,
- "ababab", whose product equals 6 * 1 = 6,
- "abababa", whose product equals 7 * 1 = 7.
The longest prefix is identical to the original string. The goal is to choose such a prefix as maximizes the value of the product. In above example the maximal product is 10.
In this problem we consider only strings that consist of lower-case English letters (a−z).
Write a function
function solution($S);
that, given a string S consisting of N characters, returns the maximal product of any prefix of the given string. If the product is greater than 1,000,000,000 the function should return 1,000,000,000.
For example, for a string:
- S = "abababa" the function should return 10, as explained above,
- S = "aaa" the function should return 4, as the product of the prefix "aa" is maximal.
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [1..300,000];
- string S is made only of lowercase letters (a−z).
Copyright 2009–2025 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
A prefix of a string S is any leading contiguous part of S. For example, "c" and "cod" are prefixes of the string "codility". For simplicity, we require prefixes to be non-empty.
The product of prefix P of string S is the number of occurrences of P multiplied by the length of P. More precisely, if prefix P consists of K characters and P occurs exactly T times in S, then the product equals K * T.
For example, S = "abababa" has the following prefixes:
- "a", whose product equals 1 * 4 = 4,
- "ab", whose product equals 2 * 3 = 6,
- "aba", whose product equals 3 * 3 = 9,
- "abab", whose product equals 4 * 2 = 8,
- "ababa", whose product equals 5 * 2 = 10,
- "ababab", whose product equals 6 * 1 = 6,
- "abababa", whose product equals 7 * 1 = 7.
The longest prefix is identical to the original string. The goal is to choose such a prefix as maximizes the value of the product. In above example the maximal product is 10.
In this problem we consider only strings that consist of lower-case English letters (a−z).
Write a function
sub solution { my ($S) = @_; ... }
that, given a string S consisting of N characters, returns the maximal product of any prefix of the given string. If the product is greater than 1,000,000,000 the function should return 1,000,000,000.
For example, for a string:
- S = "abababa" the function should return 10, as explained above,
- S = "aaa" the function should return 4, as the product of the prefix "aa" is maximal.
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [1..300,000];
- string S is made only of lowercase letters (a−z).
Copyright 2009–2025 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
A prefix of a string S is any leading contiguous part of S. For example, "c" and "cod" are prefixes of the string "codility". For simplicity, we require prefixes to be non-empty.
The product of prefix P of string S is the number of occurrences of P multiplied by the length of P. More precisely, if prefix P consists of K characters and P occurs exactly T times in S, then the product equals K * T.
For example, S = "abababa" has the following prefixes:
- "a", whose product equals 1 * 4 = 4,
- "ab", whose product equals 2 * 3 = 6,
- "aba", whose product equals 3 * 3 = 9,
- "abab", whose product equals 4 * 2 = 8,
- "ababa", whose product equals 5 * 2 = 10,
- "ababab", whose product equals 6 * 1 = 6,
- "abababa", whose product equals 7 * 1 = 7.
The longest prefix is identical to the original string. The goal is to choose such a prefix as maximizes the value of the product. In above example the maximal product is 10.
In this problem we consider only strings that consist of lower-case English letters (a−z).
Write a function
def solution(S)
that, given a string S consisting of N characters, returns the maximal product of any prefix of the given string. If the product is greater than 1,000,000,000 the function should return 1,000,000,000.
For example, for a string:
- S = "abababa" the function should return 10, as explained above,
- S = "aaa" the function should return 4, as the product of the prefix "aa" is maximal.
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [1..300,000];
- string S is made only of lowercase letters (a−z).
Copyright 2009–2025 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
A prefix of a string S is any leading contiguous part of S. For example, "c" and "cod" are prefixes of the string "codility". For simplicity, we require prefixes to be non-empty.
The product of prefix P of string S is the number of occurrences of P multiplied by the length of P. More precisely, if prefix P consists of K characters and P occurs exactly T times in S, then the product equals K * T.
For example, S = "abababa" has the following prefixes:
- "a", whose product equals 1 * 4 = 4,
- "ab", whose product equals 2 * 3 = 6,
- "aba", whose product equals 3 * 3 = 9,
- "abab", whose product equals 4 * 2 = 8,
- "ababa", whose product equals 5 * 2 = 10,
- "ababab", whose product equals 6 * 1 = 6,
- "abababa", whose product equals 7 * 1 = 7.
The longest prefix is identical to the original string. The goal is to choose such a prefix as maximizes the value of the product. In above example the maximal product is 10.
In this problem we consider only strings that consist of lower-case English letters (a−z).
Write a function
def solution(s)
that, given a string S consisting of N characters, returns the maximal product of any prefix of the given string. If the product is greater than 1,000,000,000 the function should return 1,000,000,000.
For example, for a string:
- S = "abababa" the function should return 10, as explained above,
- S = "aaa" the function should return 4, as the product of the prefix "aa" is maximal.
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [1..300,000];
- string S is made only of lowercase letters (a−z).
Copyright 2009–2025 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
A prefix of a string S is any leading contiguous part of S. For example, "c" and "cod" are prefixes of the string "codility". For simplicity, we require prefixes to be non-empty.
The product of prefix P of string S is the number of occurrences of P multiplied by the length of P. More precisely, if prefix P consists of K characters and P occurs exactly T times in S, then the product equals K * T.
For example, S = "abababa" has the following prefixes:
- "a", whose product equals 1 * 4 = 4,
- "ab", whose product equals 2 * 3 = 6,
- "aba", whose product equals 3 * 3 = 9,
- "abab", whose product equals 4 * 2 = 8,
- "ababa", whose product equals 5 * 2 = 10,
- "ababab", whose product equals 6 * 1 = 6,
- "abababa", whose product equals 7 * 1 = 7.
The longest prefix is identical to the original string. The goal is to choose such a prefix as maximizes the value of the product. In above example the maximal product is 10.
In this problem we consider only strings that consist of lower-case English letters (a−z).
Write a function
object Solution { def solution(s: String): Int }
that, given a string S consisting of N characters, returns the maximal product of any prefix of the given string. If the product is greater than 1,000,000,000 the function should return 1,000,000,000.
For example, for a string:
- S = "abababa" the function should return 10, as explained above,
- S = "aaa" the function should return 4, as the product of the prefix "aa" is maximal.
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [1..300,000];
- string S is made only of lowercase letters (a−z).
Copyright 2009–2025 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
A prefix of a string S is any leading contiguous part of S. For example, "c" and "cod" are prefixes of the string "codility". For simplicity, we require prefixes to be non-empty.
The product of prefix P of string S is the number of occurrences of P multiplied by the length of P. More precisely, if prefix P consists of K characters and P occurs exactly T times in S, then the product equals K * T.
For example, S = "abababa" has the following prefixes:
- "a", whose product equals 1 * 4 = 4,
- "ab", whose product equals 2 * 3 = 6,
- "aba", whose product equals 3 * 3 = 9,
- "abab", whose product equals 4 * 2 = 8,
- "ababa", whose product equals 5 * 2 = 10,
- "ababab", whose product equals 6 * 1 = 6,
- "abababa", whose product equals 7 * 1 = 7.
The longest prefix is identical to the original string. The goal is to choose such a prefix as maximizes the value of the product. In above example the maximal product is 10.
In this problem we consider only strings that consist of lower-case English letters (a−z).
Write a function
public func solution(_ S : inout String) -> Int
that, given a string S consisting of N characters, returns the maximal product of any prefix of the given string. If the product is greater than 1,000,000,000 the function should return 1,000,000,000.
For example, for a string:
- S = "abababa" the function should return 10, as explained above,
- S = "aaa" the function should return 4, as the product of the prefix "aa" is maximal.
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [1..300,000];
- string S is made only of lowercase letters (a−z).
Copyright 2009–2025 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
A prefix of a string S is any leading contiguous part of S. For example, "c" and "cod" are prefixes of the string "codility". For simplicity, we require prefixes to be non-empty.
The product of prefix P of string S is the number of occurrences of P multiplied by the length of P. More precisely, if prefix P consists of K characters and P occurs exactly T times in S, then the product equals K * T.
For example, S = "abababa" has the following prefixes:
- "a", whose product equals 1 * 4 = 4,
- "ab", whose product equals 2 * 3 = 6,
- "aba", whose product equals 3 * 3 = 9,
- "abab", whose product equals 4 * 2 = 8,
- "ababa", whose product equals 5 * 2 = 10,
- "ababab", whose product equals 6 * 1 = 6,
- "abababa", whose product equals 7 * 1 = 7.
The longest prefix is identical to the original string. The goal is to choose such a prefix as maximizes the value of the product. In above example the maximal product is 10.
In this problem we consider only strings that consist of lower-case English letters (a−z).
Write a function
function solution(S: string): number;
that, given a string S consisting of N characters, returns the maximal product of any prefix of the given string. If the product is greater than 1,000,000,000 the function should return 1,000,000,000.
For example, for a string:
- S = "abababa" the function should return 10, as explained above,
- S = "aaa" the function should return 4, as the product of the prefix "aa" is maximal.
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [1..300,000];
- string S is made only of lowercase letters (a−z).
Copyright 2009–2025 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
A prefix of a string S is any leading contiguous part of S. For example, "c" and "cod" are prefixes of the string "codility". For simplicity, we require prefixes to be non-empty.
The product of prefix P of string S is the number of occurrences of P multiplied by the length of P. More precisely, if prefix P consists of K characters and P occurs exactly T times in S, then the product equals K * T.
For example, S = "abababa" has the following prefixes:
- "a", whose product equals 1 * 4 = 4,
- "ab", whose product equals 2 * 3 = 6,
- "aba", whose product equals 3 * 3 = 9,
- "abab", whose product equals 4 * 2 = 8,
- "ababa", whose product equals 5 * 2 = 10,
- "ababab", whose product equals 6 * 1 = 6,
- "abababa", whose product equals 7 * 1 = 7.
The longest prefix is identical to the original string. The goal is to choose such a prefix as maximizes the value of the product. In above example the maximal product is 10.
In this problem we consider only strings that consist of lower-case English letters (a−z).
Write a function
Private Function solution(S As String) As Integer
that, given a string S consisting of N characters, returns the maximal product of any prefix of the given string. If the product is greater than 1,000,000,000 the function should return 1,000,000,000.
For example, for a string:
- S = "abababa" the function should return 10, as explained above,
- S = "aaa" the function should return 4, as the product of the prefix "aa" is maximal.
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [1..300,000];
- string S is made only of lowercase letters (a−z).
Copyright 2009–2025 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
