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  1. Zig Zag Sequence
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Zig Zag Sequence

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1046 Discussions

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  • misha_arp
     + 1 comment

    I got my output equal to the expected and I only modified 3 lines of code. Still getting the test failing. Using Java 8.

        public static void findZigZagSequence(int [] a, int n){
        Arrays.sort(a);
        int mid = (n + 1)/2;
        int temp = a[--mid];
        a[mid] = a[n - 1];
        a[n - 1] = temp;
    
        int st = mid + 1;
        int ed = n - 2;
        while(st <= ed){
            temp = a[st];
            a[st] = a[ed];
            a[ed] = temp;
            st = st + 1;
            ed = ed - 1;
        }
        for(int i = 0; i < n; i++){
            if(i > 0) System.out.print(" ");
            System.out.print(a[i]);
        }
        System.out.println();
    }

  • abelselfi12
     + 1 comment

    i have got the same expected result as the output, still saying u failed. i just dont why ?

    • def findZigZagSequence(a, n):
    • a.sort()
    • mid = int((n + 1)//2)-1
    • a[mid], a[n-1] = a[n-1], a[mid]
    • c=a[:mid+1]
    • b=sorted(a[mid+1:],reverse=True)
    • a=c+b
    • print(" ".join(map(str, a)))
      • test_cases = int(input())
    • "
    • for cs in range (test_cases):
    • n = int(input())
    • a = list(map(int, input().split()))
    • findZigZagSequence(a, n)

  • jongseokpark910
     + 1 comment
    def findZigZagSequence(a, n):
    a.sort()
    mid = n//2
    a[mid], a[n-1] = a[n-1], a[mid]

    st = mid + 1
    ed = n - 2
    while(st <= ed):
        a[st], a[ed] = a[ed], a[st]
        st = st + 1
        ed = ed - 1

    for i in range (n):
        if i == n-1:
            print(a[i])
        else:
            print(a[i], end = ' ')
    return

test_cases = int(input())
for cs in range (test_cases):
    n = int(input())
    a = list(map(int, input().split()))
    findZigZagSequence(a, n)
`

This python solutions is Success. but I feel it's wrong answer.(line 3:` mid // 2`  Doesn't meet prerequisites)

  • kerchmaksim
     + 0 comments

    With Java 8 it works for me, with Java 7 it doesn't. It's better to refresh and make only the 3 required line changes.

  • sebasmb94
     + 0 comments

    Submitted a support ticket for this specific challenge. Since as others manifested here. The code to modify is not present in all the languages just in a few. Hope it helps for new people checking the challenge.