poj 2260 Error Correction

#include <iostream>using namespace std;int main(){    int a[105][105],b[105],c[105],i,j,n,sum;    while(cin >> n,n)    {        for(i = 0; i<n; i++)        { for(j = 0; j<n; j++) {     cin >> a[i][j]; }        }        int cnt = 0;        for(i = 0; i<n; i++)        { b[i] = 0; for(j = 0; j<n; j++) {     b[i]+=a[i][j]; }        }        for(i = 0; i<n; i++)        { c[i] = 0; for(j = 0; j<n; j++) {     c[i]+=a[j][i]; }        }        int sum1=0,sum2 = 0,flag1,flag2;        for(i = 0; i<n; i++)        { if(b[i]%2) {     sum1++;     flag1 = i; }        }        for(i = 0; i<n; i++)        { if(c[i]%2) {     sum2++;     flag2 = i; }        }        if(sum1 > 1 || sum2>1) cout << "Corrupt" << endl;        else if(!sum1 && !sum2) cout << "OK" << endl;        else cout << "Change bit (" << flag1+1 << "," << flag2+1 << ")" << endl;    }    return 0;}