Pattern - ZigZag Number Square - C

Given an integer N as the input, print the pattern as given in the Example Input/Output section.

Input Format: The first line contains N. 

Output Format: N lines containing the desired pattern. 

Boundary Conditions: 

• 2 <= N <= 50 

Example Input/Output 1: 

Input: 

5 

Output: 

1 2 3 4 5 

10 9 8 7 6 

11 12 13 14 15 

20 19 18 17 16 

21 22 23 24 25 

Example Input/Output 2: 

Input: 8 

Output: 

1 2 3 4 5 6 7 8 

16 15 14 13 12 11 10 9 

17 18 19 20 21 22 23 24 

32 31 30 29 28 27 26 25 

33 34 35 36 37 38 39 40 

48 47 46 45 44 43 42 41 

49 50 51 52 53 54 55 56 

64 63 62 61 60 59 58 57

Source Code:

#include<stdio.h>

int main() {

    int N;

    scanf("%d",&N);

    int i,j,r,d=0;

    for(i=0;i<N;i++)

    {

        r=N*(i+1);

        d=r-N+1;

        if(i%2==0)

        {

            for(j=N-1;j>=0;j--)

                printf("%d ",d++);

        }

       else

        {

            for(j=0;j<N;j++)

                printf("%d ",r--);

        }

        printf("\n");

    }

}