Test results - Codility

Tasks Details

medium

1. MaxCounters

Calculate the values of counters after applying all alternating operations: increase counter by 1; set value of all counters to current maximum.

Task Score

100%

Correctness

100%

Performance

100%

You are given N counters, initially set to 0, and you have two possible operations on them:

increase(X) − counter X is increased by 1,

max counter − all counters are set to the maximum value of any counter.

A non-empty array A of M integers is given. This array represents consecutive operations:

if A[K] = X, such that 1 ≤ X ≤ N, then operation K is increase(X),

if A[K] = N + 1 then operation K is max counter.

For example, given integer N = 5 and array A such that:

A[0] = 3 A[1] = 4 A[2] = 4 A[3] = 6 A[4] = 1 A[5] = 4 A[6] = 4

the values of the counters after each consecutive operation will be:

(0, 0, 1, 0, 0) (0, 0, 1, 1, 0) (0, 0, 1, 2, 0) (2, 2, 2, 2, 2) (3, 2, 2, 2, 2) (3, 2, 2, 3, 2) (3, 2, 2, 4, 2)

The goal is to calculate the value of every counter after all operations.

Write a function:

class Solution { public int[] solution(int N, int[] A); }

that, given an integer N and a non-empty array A consisting of M integers, returns a sequence of integers representing the values of the counters.

Result array should be returned as an array of integers.

For example, given:

A[0] = 3 A[1] = 4 A[2] = 4 A[3] = 6 A[4] = 1 A[5] = 4 A[6] = 4

the function should return [3, 2, 2, 4, 2], as explained above.

Write an efficient algorithm for the following assumptions:

N and M are integers within the range [1..100,000];

each element of array A is an integer within the range [1..N + 1].

Solution

Programming language used Java 8

Time spent on task 9 minutes

Notes

not defined yet

Task timeline

Code: 06:41:55 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        // write your code in Java SE 8
    }
}

Code: 06:42:25 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 
    }
}

Code: 06:42:36 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        
    }
}

Code: 06:42:49 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;

        return result;
    }
}

Code: 06:43:01 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        for (int num : A) {
            
        }
        return result;
    }
}

Code: 06:43:46 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        for (int num : A) {
            if ()
        }
        return result;
    }
}

Code: 06:44:11 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        for (int num : A) {
            if (num == N + 1) { // Max is N + 1
                
            }
        }
        return result;
    }
}

Code: 06:44:21 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        for (int num : A) {
            if (num == N + 1) { // Maximum number is N + 1.
                
            }
        }
        return result;
    }
}

Code: 06:44:36 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        int init = 0;
        for (int num : A) {
            if (num == N + 1) { // Maximum number is N + 1.
                init = max;
            }
        }
        return result;
    }
}

Code: 06:44:55 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        int init = 0;
        for (int num : A) {
            if (num == N + 1) { // Maximum number is N + 1.
                init = max;
            } else {
                if (init > result[num - 1])
            }
        }
        return result;
    }
}

Code: 06:45:25 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        int init = 0;
        for (int num : A) {
            if (num == N + 1) { // Maximum number is N + 1.
                init = max;
            } else {
                if (init > result[num - 1]) {
                    result[num - 1] = init + 1;
                } else {
                    result[num - 1]++;
                }
            }
        }
        return result;
    }
}

Code: 06:45:42 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        int init = 0;
        for (int num : A) {
            if (num == N + 1) { // Maximum number is N + 1.
                // Over than 
                init = max;
            } else {
                if (init > result[num - 1]) {
                    result[num - 1] = init + 1;
                } else {
                    result[num - 1]++;
                }
            }
        }
        return result;
    }
}

Code: 06:45:59 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        int init = 0;
        for (int num : A) {
            if (num == N + 1) { // Over than array size.
                // Maximum number is N + 1
                init = max;
            } else {
                if (init > result[num - 1]) {
                    result[num - 1] = init + 1;
                } else {
                    result[num - 1]++;
                }
            }
        }
        return result;
    }
}

Code: 06:46:16 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        int init = 0;
        for (int num : A) {
            if (num == N + 1) { // Over than array size, Maximum number is N + 1
                init = max;
            } else {
                if (init > result[num - 1]) {
                    result[num - 1] = init + 1;
                } else {
                    result[num - 1]++;
                }
            }
        }
        return result;
    }
}

Code: 06:46:26 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        int init = 0;
        for (int num : A) {
            if (num == N + 1) { // Over than array size, Maximum number is N + 1
                
                init = max;
            } else {
                if (init > result[num - 1]) {
                    result[num - 1] = init + 1;
                } else {
                    result[num - 1]++;
                }
            }
        }
        return result;
    }
}

Code: 06:46:49 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        int init = 0;
        for (int num : A) {
            if (num == N + 1) { // Over than array size and maximum number is N + 1
                // Change value to max counter.
                init = max;
            } else {
                if (init > result[num - 1]) {
                    result[num - 1] = init + 1;
                } else {
                    result[num - 1]++;
                }
            }
        }
        return result;
    }
}

Code: 06:47:03 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        int init = 0;
        for (int num : A) {
            if (num == N + 1) { // Over than array size and maximum number is N + 1
                // Change init value to max value.
                init = max;
            } else {
                if (init > result[num - 1]) {
                    result[num - 1] = init + 1;
                } else {
                    result[num - 1]++;
                }
            }
        }
        return result;
    }
}

Code: 06:47:19 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        int init = 0;
        for (int num : A) {
            if (num == N + 1) { // Over than array size and maximum number is N + 1
                // Set init value using max value.
                init = max;
            } else {
                if (init > result[num - 1]) {
                    result[num - 1] = init + 1;
                } else {
                    result[num - 1]++;
                }
            }
        }
        return result;
    }
}

Code: 06:47:37 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        int init = 0;
        for (int num : A) {
            if (num == N + 1) { // Over than array size and maximum number is N + 1
                // Set init value using max value.
                init = max;
            } else {
                if (init > result[num - 1]) { // Lower than init value.
                    result[num - 1] = init + 1;
                } else {
                    result[num - 1]++;
                }
            }
        }
        return result;
    }
}

Code: 06:48:03 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        int init = 0;
        for (int num : A) {
            if (num == N + 1) { // Over than array size and maximum number is N + 1
                // Set init value using max value.
                init = max;
            } else {
                if (init > result[num - 1]) {
                    result[num - 1] = init + 1;
                } else {
                    result[num - 1]++;
                }
                // Save maximum value.
                if (result[num - 1] > max) {
                    max = result[num - 1];
                }
            }
        }
        return result;
    }
}

Code: 06:48:21 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        int init = 0;
        for (int num : A) {
            if (num == N + 1) { // Over than array size and maximum number is N + 1
                // Set init value using max value.
                init = max;
            } else {
                if (init > result[num - 1]) {
                    result[num - 1] = init + 1;
                } else {
                    result[num - 1]++;
                }
                // Save maximum value.
                if (result[num - 1] > max) {
                    max = result[num - 1];
                }
            }
        }
        // If lower than init value, change each values.
        return result;
    }
}

Code: 06:48:34 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        int init = 0;
        for (int num : A) {
            if (num == N + 1) { // Over than array size and maximum number is N + 1
                // Set init value using max value.
                init = max;
            } else {
                if (init > result[num - 1]) {
                    result[num - 1] = init + 1;
                } else {
                    result[num - 1]++;
                }
                // Save maximum value.
                if (result[num - 1] > max) {
                    max = result[num - 1];
                }
            }
        }
        // If lower than init value, change each values.
        for (int idx = 0; idx < result.length; idx++) {
            
        }
        return result;
    }
}

Code: 06:48:48 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        int init = 0;
        for (int num : A) {
            if (num == N + 1) { // Over than array size and maximum number is N + 1
                // Set init value using max value.
                init = max;
            } else {
                if (init > result[num - 1]) {
                    result[num - 1] = init + 1;
                } else {
                    result[num - 1]++;
                }
                // Save maximum value.
                if (result[num - 1] > max) {
                    max = result[num - 1];
                }
            }
        }
        // If lower than init value, change each values.
        for (int idx = 0; idx < N; idx++) {
            if ()
        }
        return result;
    }
}

Code: 06:49:04 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        int init = 0;
        for (int num : A) {
            if (num == N + 1) { // Over than array size and maximum number is N + 1
                // Set init value using max value.
                init = max;
            } else {
                if (init > result[num - 1]) {
                    result[num - 1] = init + 1;
                } else {
                    result[num - 1]++;
                }
                // Save maximum value.
                if (result[num - 1] > max) {
                    max = result[num - 1];
                }
            }
        }
        // If lower than init value, change each values.
        for (int idx = 0; idx < N; idx++) {
            if
        }
        return result;
    }
}

Code: 06:49:34 UTC, java, autosave

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        int init = 0;
        for (int num : A) {
            if (num == N + 1) { // Over than array size and maximum number is N + 1
                // Set init value using max value.
                init = max;
            } else {
                if (init > result[num - 1]) {
                    result[num - 1] = init + 1;
                } else {
                    result[num - 1]++;
                }
                // Save maximum value.
                if (result[num - 1] > max) {
                    max = result[num - 1];
                }
            }
        }
        // If lower than init value, change each values.
        for (int idx = 0; idx < N; idx++) {
            if (result[idx] < init) {
                result[idx] = init;
            }
        }
        return result;
    }
}

Code: 06:49:34 UTC, java, verify, result: Passed

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// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        int init = 0;
        for (int num : A) {
            if (num == N + 1) { // Over than array size and maximum number is N + 1
                // Set init value using max value.
                init = max;
            } else {
                if (init > result[num - 1]) {
                    result[num - 1] = init + 1;
                } else {
                    result[num - 1]++;
                }
                // Save maximum value.
                if (result[num - 1] > max) {
                    max = result[num - 1];
                }
            }
        }
        // If lower than init value, change each values.
        for (int idx = 0; idx < N; idx++) {
            if (result[idx] < init) {
                result[idx] = init;
            }
        }
        return result;
    }
}

Analysis

expand all Example tests

▶

example
example test

✔

0.008 s

Code: 06:50:00 UTC, java, verify, result: Passed

show code in pop-up

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        int init = 0;
        for (int num : A) {
            if (num == N + 1) { // Over than array size and maximum number is N + 1
                // Set init value using max value.
                init = max;
            } else {
                if (init > result[num - 1]) {
                    result[num - 1] = init + 1;
                } else {
                    result[num - 1]++;
                }
                // Save maximum value.
                if (result[num - 1] > max) {
                    max = result[num - 1];
                }
            }
        }
        // If lower than init value, change each values.
        for (int idx = 0; idx < N; idx++) {
            if (result[idx] < init) {
                result[idx] = init;
            }
        }
        return result;
    }
}

Analysis

expand all Example tests

▶

example
example test

✔

0.008 s

Code: 06:50:04 UTC, java, final, score: 100

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

// 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 int[] solution(int N, int[] A) {
        int[] result = new int[N];
        int max = 0;
        int init = 0;
        for (int num : A) {
            if (num == N + 1) { // Over than array size and maximum number is N + 1
                // Set init value using max value.
                init = max;
            } else {
                if (init > result[num - 1]) {
                    result[num - 1] = init + 1;
                } else {
                    result[num - 1]++;
                }
                // Save maximum value.
                if (result[num - 1] > max) {
                    max = result[num - 1];
                }
            }
        }
        // If lower than init value, change each values.
        for (int idx = 0; idx < N; idx++) {
            if (result[idx] < init) {
                result[idx] = init;
            }
        }
        return result;
    }
}

Analysis summary

The solution obtained perfect score.

Analysis

Detected time complexity:

O(N + M)

expand all Example tests

▶

example
example test

✔

0.012 s

expand all Correctness tests

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extreme_small
all max_counter operations

✔

0.008 s

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single
only one counter

✔

0.012 s

0.008 s

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small_random1
small random test, 6 max_counter operations

✔

0.012 s

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small_random2
small random test, 10 max_counter operations

✔

0.012 s

expand all Performance tests

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medium_random1
medium random test, 50 max_counter operations

✔

0.024 s

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medium_random2
medium random test, 500 max_counter operations

✔

0.024 s

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large_random1
large random test, 2120 max_counter operations

✔

0.404 s

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large_random2
large random test, 10000 max_counter operations

✔

0.572 s

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extreme_large
all max_counter operations

✔

1.312 s

1.208 s