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>
#pragma GCC optimize("O3", "unroll-loops")
#define ll long long
// #define int long long
#define pb push_back
#define fi first
#define se second
#define lf (id<<1)
#define rg ((id<<1)|1)
#define md ((l+r)>>1)
#define ld long double
using namespace std;
typedef pair<int,int> pii;
typedef pair<int, pii> ipii;
const int MAXN = 3002;
int n, m;
char a[MAXN][MAXN];
int b[MAXN][MAXN], cnt;
vector <vector<int>> adj;
void add(int x, int y){ adj[y].pb(x); }
int day;
vector <int> mat, vis;
vector<bool> done;
bool dfs(int nw){
if(vis[nw] == day) return 0;
vis[nw] = day;
for(auto nx : adj[nw]){
if(mat[nx]==0 || dfs(mat[nx])){
mat[nx] = nw; return 1;
}
}
return 0;
}
signed main(){
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
cin >> n >> m;
for(int i=1; i<=n; i++)
for(int j=1; j<=m; j++) cin >> a[i][j];
vector<int>te; adj.pb(te);
int c1 = 0, c2 = 0;
for(int i=1; i<=n; i++){
for(int j=1; j<=m-2; j++){
if(a[i][j]=='R' && a[i][j+1]=='G' && a[i][j+2]=='W'){
c1++;
}
}
}
for(int i=1; i<=n-2; i++){
for(int j=1; j<=m; j++){
if(a[i][j]=='R' && a[i+1][j]=='G' && a[i+2][j]=='W'){
c2++;
}
}
}
int num = 0;
// if(c1 < c2){
for(int i=1; i<=n; i++){
for(int j=1; j<=m-2; j++){
if(a[i][j]=='R' && a[i][j+1]=='G' && a[i][j+2]=='W'){
adj.pb(te);
b[i][j] = ++cnt;
b[i][j+1] = cnt;
b[i][j+2] = cnt;
}
}
}
num = cnt;
for(int i=1; i<=n-2; i++){
for(int j=1; j<=m; j++){
if(a[i][j]=='R' && a[i+1][j]=='G' && a[i+2][j]=='W'){
++cnt;
add(cnt, b[i][j]);
add(cnt, b[i+1][j]);
add(cnt, b[i+2][j]);
}
}
}
// } else {
// for(int i=1; i<=n-2; i++){
// for(int j=1; j<=m; j++){
// if(a[i][j]=='R' && a[i+1][j]=='G' && a[i+2][j]=='W'){
// adj.pb(te);
// ++cnt;
// b[i][j] = cnt;
// b[i+1][j] = cnt;
// b[i+2][j] = cnt;
// }
// }
// }
// num = cnt;
// for(int i=1; i<=n; i++){
// for(int j=1; j<=m-2; j++){
// if(a[i][j]=='R' && a[i][j+1]=='G' && a[i][j+2]=='W'){
// ++cnt;
// add(cnt, b[i][j]);
// add(cnt, b[i][j+1]);
// add(cnt, b[i][j+2]);
// }
// }
// }
// }
mat.resize(num+2); vis.resize(num+2); done.resize(num+2);
int ANS = 0;
for(int i=1; i<=num; i++){
for(auto nx : adj[i]){
if(mat[nx] == 0){
mat[nx] = i;
done[i] = 1;
ANS++;
break;
}
}
}
for(int i=1; i<=num; i++){
if(done[i]) continue;
day++;
ANS += dfs(i);
}
cout << cnt-ANS << '\n';
}
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