zoj 1949 Error Correction

#include<stdio.h>#include<string.h>int map[110][110],r,c;int main(){int n,i,j,ii,jj;while(scanf("%d",&n),n){memset(map,0,sizeof(map));for(i=1;i<=n;i++)for(j=1;j<=n;j++){scanf("%d",&map[i][j]);map[i][0]+=map[i][j];map[0][j]+=map[i][j];}r=0;c=0;for(i=1;i<=n;i++){if(map[0][i]%2){c++;jj=i;}if(map[i][0]%2){r++;ii=i;}}if(r==0&&c==0)printf("OKn");else if(r==1&&c==1)printf("Change bit (%d,%d)n",ii,jj);else printf("Corruptn");}return 0;}