Svrteni dijagonali

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

int main() {

  int n;
  scanf("%d", &n);

  int a[n][n];

    int i, j;

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

      if (i == j) {

        int temp;
        temp = a[i][j];
        a[i][j] = a[i][n-1-j];
        a[i][n-1-j] = temp;
      }
      if (i+j == n-1) continue;

      if ( !(i==j)&&!(i+j == n-1) && (i < n/2) ) {

        int temp;
        temp = a[i][j];
        a[i][j] = a[n-1-i][j];
        a[n-1-i][j] = temp;      }
    }
  }
  for (i = 0; i < n; i++) {
    for (j = 0; j < n; j++) {
      printf("%d ", a[i][j]);
    }
    printf("\n");
  }

  return 0;
}