Vertical Zig Zag Pattern

The program must accept an integer N as the input. The program must print the desired pattern as shown in the Example Input/Output section.

Boundary Condition(s):
2 <= N <= 50

Input Format:
The first line contains N.

Output Format:
The first N lines contain the desired pattern as shown in the Example Input/Output section.

Example Input/Output 1:
Input:
5
Output:
5 50 55 100 105
10 45 60 95 110
15 40 65 90 115
20 35 70 85 120
25 30 75 80 125

#include<stdio.h>
#include<stdlib.h>

int main()
{
int n;
scanf("%d",&n);
int a[n][n];
int k=n;
for(int i=1;i<=n;i++)
{
if(i%2!=0)
{
for(int j=0;j<n;j++)
{
a[j][i-1]=k;
k+=n;
}
}
else
{
for(int j=n-1;j>=0;j--)
{
a[j][i-1]=k;
k+=n;
}
}
}

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