View Code of Problem 3311

#include<stdio.h>
int main(){
	int m,n;
	scanf("%d %d",&m,&n);
	int i,j;
	int num = 0;
	int index,flag = 0;
	char a[m][n];
	for(i = 0;i < m; i++){
		if(flag == 0){
			for(j = 0;j < n; j++){
				index = num++%26;
				a[i][j] = index + 'A';
			}
			flag = 1;
		}
		else{
			for(j = n-1;j >= 0; j--){
				index = num++%26;
				a[i][j] = index + 'A';
			}
			flag = 0;	
		}
	}
	for(i = 0;i < m; i++){
		for(j = 0;j < n; j++){
			printf("%c   ",a[i][j]);
		}
		printf("\n");
	}
}