View Code of Problem 51

#include<stdio.h>
main(){
  int n;
  int a[10][10];
  int sum=0;
  scanf("%d",&n);
  for(int j=0;j<n;j++){
    for(int i=0;i<n;i++)
  {
    scanf("%d",&a[j][i]);
  }
  }
  for(int j=0,m=n-1;j<n;j++,m--){
    for(int i=0,l=n-1;i<n;i++,l--)
  {
    b[i][j]=a[m][l];
  }
  }
  for(int i=0;i<n;i++)
  {
    for(int j=0;j<i;j++)
      sum+=a[i][j];
  }
  printf("%d",sum);
}
/*
Main.c:2:1: warning: return type defaults to 'int' [-Wimplicit-int]
 main(){
 ^~~~
Main.c: In function 'main':
Main.c:16:5: error: 'b' undeclared (first use in this function)
     b[i][j]=a[m][l];
     ^
Main.c:16:5: note: each undeclared identifier is reported only once for each function it appears in
*/