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  1. Zig Zag Sequence
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Zig Zag Sequence

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155 Discussions

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  • alfredo_e_p5787
     + 0 comments

    with C#: Output as expected but somwehow not passing not even the first test case.

    Error

    Traceback (most recent call last):
  File "Solution.py", line 178, in <module>
    run_custom_checker(t_obj, r_obj)
  File "Solution.py", line 77, in run_custom_checker
    system_code = code_data[t_obj.submission_language].strip()
KeyError: u'csharp'Traceback (most recent call last):
  File "Solution.py", line 178, in <module>
    run_custom_checker(t_obj, r_obj)
  File "Solution.py", line 77, in run_custom_checker
    system_code = code_data[t_obj.submission_language].strip()
KeyError: u'csharp'

    **C# code **

    using System;
using System.Collections.Generic;
using System.IO;


class Solution
{

    private static List<int> findZigZagSequence(List<int> ar)
    {
        List<int> zigZagedList = ar.ToList();
        zigZagedList.Sort();
        zigZagedList[ar.Count / 2] = (from n in ar select n).Max();
        zigZagedList[ar.Count - 1] = ar[ar.Count / 2];
        int startIndex = (ar.Count / 2) + 1;
        int endIndex = ar.Count - startIndex;
        List<int> decreasingList = zigZagedList.GetRange(startIndex, endIndex);
        decreasingList.Sort((a, b) => b.CompareTo(a));
        zigZagedList.RemoveRange(startIndex, endIndex);
        zigZagedList.AddRange(decreasingList);

        return zigZagedList;
    }

    static void Main(String[] args)
    {
        int t = Convert.ToInt32(Console.ReadLine().Trim());


        for (int i = 0; i < t; i++)
        {
            int n = Convert.ToInt32(Console.ReadLine().Trim());
            List<int> ar = Console.ReadLine().TrimEnd().Split(' ').ToList().Select(arTemp => Convert.ToInt32(arTemp)).ToList();
            Console.WriteLine(String.Join(' ', findZigZagSequence(ar)));
        }
    }
}
}

  • Reshmafredy999
     + 0 comments

    Python:

    def findZigZagSequence(a, n):
    a.sort()
    mid = int((n - 1)/2) #first
    a[mid], a[n-1] = a[n-1], a[mid]

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

    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)

  • gewinum
     + 0 comments

    hackerrank should fix their stuff, there's no code in c#

  • rajiv84ia
     + 0 comments

    am getting same output but it's shows wrong answer why ??

    include

    include

    include

    include

    int main() {

    /* Enter your code here. Read input from STDIN. Print output to STDOUT */    
int temp, mid, l, n, k;
scanf("%d",&l);
scanf("%d",&n);
int a[n];
for(int i=0; i<n; i++){
    scanf("%d",&a[i]);
}
k=(n+1)/2;
for(int i=0; i<n-1; i++){
    for(int j=i+1; j<n; j++)
    {
        if(a[i]>a[j]){
            temp=a[i];
            a[i]=a[j];
            a[j]=temp;
        }
    }
}

int temp1=a[k-1];
    a[k-1]=a[n-1];
    a[n-1]=temp1;
    int j=n-2;
while(k<=j){
    int temp3=a[k];
    a[k]=a[j];
    a[j]=temp3;
    k++;
    j--;
}


for(int i=0;i<n; i++){
    printf("%d",a[i]);
    printf(" ");
}

return 0;

    }

  • nathangroupp
     + 0 comments

    The findZigZagSequence function is not provided.