Tasks Details
easy
1.
MaxSliceSum
Find a maximum sum of a compact subsequence of array elements.
Task Score
92%
Correctness
100%
Performance
80%
A non-empty array A consisting of N integers is given. A pair of integers (P, Q), such that 0 ≤ P ≤ Q < N, is called a slice of array A. The sum of a slice (P, Q) is the total of A[P] + A[P+1] + ... + A[Q].
Write a function:
class Solution { public int solution(int[] A); }
that, given an array A consisting of N integers, returns the maximum sum of any slice of A.
For example, given array A such that:
A[0] = 3 A[1] = 2 A[2] = -6 A[3] = 4 A[4] = 0the function should return 5 because:
- (3, 4) is a slice of A that has sum 4,
- (2, 2) is a slice of A that has sum −6,
- (0, 1) is a slice of A that has sum 5,
- no other slice of A has sum greater than (0, 1).
Write an efficient algorithm for the following assumptions:
- N is an integer within the range [1..1,000,000];
- each element of array A is an integer within the range [−1,000,000..1,000,000];
- the result will be an integer within the range [−2,147,483,648..2,147,483,647].
Copyright 2009–2024 by Codility Limited. All Rights Reserved. Unauthorized copying, publication or disclosure prohibited.
Solution
Programming language used Java 8
Time spent on task 1 minutes
Notes
not defined yet
Task timeline
Code: 12:50:26 UTC,
java,
autosave
Code: 12:50:30 UTC,
java,
verify,
result: Passed
// you can also use imports, for example:
// import java.util.*;
// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
class Solution {
public static int solution(int[] A) {
// write your code in Java SE 8
int maxEnding = 0;
int maxSlice = Integer.MIN_VALUE;
int maxValue = Integer.MIN_VALUE;
for (int a : A) {
if ((maxEnding < 0 || maxSlice < 0) && a > 0) {
if(maxSlice > maxValue){
maxValue = maxSlice;
}
maxSlice = 0;
maxEnding = 0;
}
maxEnding = Math.max(Integer.MIN_VALUE, maxEnding + a);
maxSlice = Math.max(maxSlice, maxEnding);
if (a > maxValue) {
maxValue = a;
}
if(maxSlice > maxValue){
maxValue = maxSlice;
}
}
return (maxValue > maxSlice) ? maxValue : maxSlice;
}
}
Analysis
Code: 12:50:35 UTC,
java,
verify,
result: Passed
// you can also use imports, for example:
// import java.util.*;
// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
class Solution {
public static int solution(int[] A) {
// write your code in Java SE 8
int maxEnding = 0;
int maxSlice = Integer.MIN_VALUE;
int maxValue = Integer.MIN_VALUE;
for (int a : A) {
if ((maxEnding < 0 || maxSlice < 0) && a > 0) {
if(maxSlice > maxValue){
maxValue = maxSlice;
}
maxSlice = 0;
maxEnding = 0;
}
maxEnding = Math.max(Integer.MIN_VALUE, maxEnding + a);
maxSlice = Math.max(maxSlice, maxEnding);
if (a > maxValue) {
maxValue = a;
}
if(maxSlice > maxValue){
maxValue = maxSlice;
}
}
return (maxValue > maxSlice) ? maxValue : maxSlice;
}
}
Analysis
Code: 12:50:39 UTC,
java,
final,
score:
92
// you can also use imports, for example:
// import java.util.*;
// you can write to stdout for debugging purposes, e.g.
// System.out.println("this is a debug message");
class Solution {
public static int solution(int[] A) {
// write your code in Java SE 8
int maxEnding = 0;
int maxSlice = Integer.MIN_VALUE;
int maxValue = Integer.MIN_VALUE;
for (int a : A) {
if ((maxEnding < 0 || maxSlice < 0) && a > 0) {
if(maxSlice > maxValue){
maxValue = maxSlice;
}
maxSlice = 0;
maxEnding = 0;
}
maxEnding = Math.max(Integer.MIN_VALUE, maxEnding + a);
maxSlice = Math.max(maxSlice, maxEnding);
if (a > maxValue) {
maxValue = a;
}
if(maxSlice > maxValue){
maxValue = maxSlice;
}
}
return (maxValue > maxSlice) ? maxValue : maxSlice;
}
}
Analysis summary
The following issues have been detected: wrong answers.
Analysis
Detected time complexity:
O(N)
expand all
Correctness tests
1.
0.004 s
OK
2.
0.004 s
OK
3.
0.004 s
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9.
0.004 s
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1.
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3.
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4.
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5.
0.008 s
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6.
0.004 s
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9.
0.004 s
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10.
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12.
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18.
0.004 s
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19.
0.004 s
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0.004 s
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0.004 s
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0.004 s
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1.
0.004 s
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1.
0.004 s
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0.004 s
OK
1.
0.004 s
OK