poj 2579 Blurred Vision

#include<iostream>#include<string>using namespace std;char d[15][15];int main(){string op;int r,c,i,j;while(cin>>op){if(op=="START"){cin>>r>>c;for(i=0;i<r;i++){for(j=0;j<c;j++)cin>>d[i][j];}cin>>op;for(i=0;i<r-1;i++){for(j=0;j<c-1;j++){cout<<char((d[i][j]+d[i][j+1]+d[i+1][j]+d[i+1][j+1])/4);}cout<<endl;}}else{break;}}return 0;}