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| #include <bits/stdc++.h>
#define N 105
#define mod 1000000007
#define FOR(i,n) for(int i=0;i<n;i++)
#define ios ios::sync_with_stdio(0)
using namespace std;
signed main(){
ios;
int n;
while(cin>>n && n!=0){
int row_sum[N],col_sum[N],arr[N][N];
memset(row_sum,0,sizeof(row_sum));
memset(col_sum,0,sizeof(col_sum));
memset(arr,0,sizeof(arr));
for(int i=1;i<=n;i++){
for(int j=1;j<=n;j++){
cin>>arr[i][j];
row_sum[i]+=arr[i][j];
col_sum[j]+=arr[i][j];
}
}
int rcnt = 0,ccnt = 0;
int rind = 0,cind = 0;
for(int i=1;i<=n;i++){
if(row_sum[i]%2){
rcnt += 1;
rind = i;
}
if(col_sum[i]%2){
ccnt += 1;
cind = i;
}
}
if(rcnt==0 && ccnt==0)cout<<"OK"<<endl;
else if(rcnt==1 && ccnt==1)cout<<"Change bit ("<<rind<<","<<cind<<")"<<endl;
else cout<<"Corrupt"<<endl;
}
}
|