This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
char dum[3007][3007];
int main()
{
    int n, m;
    cin >> n >> m;
    for(int i = 1; i <= n; ++i)
    {
        string s;
        cin >> s;
        for(int j = 1; j <= m; ++j)
            dum[i][j] = s[j];
    }
    int odp = 0;
    for(int i = 1; i <= n; ++i)
        for(int j = 1; j <= m; ++j)
        {
            if(dum[i][j] == 'R' && dum[i][j+1] == 'G' && dum[i][j+2] == 'W')
            {
                if(dum[i-1][j+1] == 'R' && dum[i+1][j+1] == 'W')
                {
                    ++odp;
                    dum[i-1][j+1] = '.';
                    dum[i][j+1] = '.';
                    dum[i][j+2] = '.';
                }
                else
                {
                    ++odp;
                    dum[i][j] = '.';
                    dum[i][j+1] = '.';
                    dum[i][j+2] = '.';
                }
            }
            if(dum[i-1][j] == 'R' && dum[i][j] == 'G' && dum[i+1][j] == 'W')
            {
                ++odp;
                dum[i-1][j] = '.';
                dum[i][j] = '.';
                dum[i+1][j] = '.';
            }
        }
    cout << odp;
}
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