uva : 541 - Error Correction

#include < stdio.h > 
#include < string.h >
     int main() {
         int n;
         while (scanf("%d", & n) == 1 && n != 0) {
             int num1[200][200], i, j, k, l, m = 0, row, col, c1 = 0, c2 = 0;
             for (i = 0; i < n; i++) {
                 for (j = 0; j < n; j++) {
                     scanf("%d", & num1[i][j]);
                 }
             }
             for (i = 0; i < n; i++) {
                 k = 0;
                 for (j = 0; j < n; j++) {
                     k = k + num1[i][j];
                 }
                 if (k % 2 == 1) {
                     c1++;
                     row = i;
                 }
             }
             for (j = 0; j < n; j++) {
                 k = 0;
                 for (i = 0; i < n; i++) {
                     k = k + num1[i][j];
                 }
                 if (k % 2 == 1) {
                     c2++;
                     col = j;
                 }
             }
             if (c1 == 0 && c2 == 0) {
                 printf("OK\n");
             } else if (c1 == 1 && c2 == 1) {
                 printf("Change bit (%d,%d)\n", row + 1, col + 1);
             } else {
                 printf("Corrupt\n");
             }
         }
         return 0;
     }