이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vii;
typedef pair<int,int> pi;
typedef vector<pi> pii;
typedef tuple<int,int,int> tii;
typedef vector<ll> li;
typedef vector<li> lii;
#define REP(i,a,b) for(int i=a;i<b;i++)
#define F first
#define S second
#define PB push_back
#define MP make_pair
#define LSOne(s) ((s)&(-s))
ll INF=1000000000000000010;
int inf=1e9+10;
ll M=1e9+7;
int main() {
int n,m;cin>>n>>m;
vector<vector<char>> a(n,vector<char>(m));
REP(i,0,n)REP(j,0,m)cin>>a[i][j];
int ans=0;
REP(j,1,n+m+1){
vii dp(n,vi(3,0));
REP(i,0,n){
int pos=j-i;
if(i!=0)dp[i][0]=*max_element(dp[i-1].begin(),dp[i-1].end());
if(pos>=m||a[i][pos]!='G')continue;
if(i==0&&pos-1>=0&&pos+1<m&&a[i][pos-1]=='R'&&a[i][pos+1]=='W')dp[i][1]=1;
if(i!=0&&pos-1>=0&&pos+1<m&&a[i][pos-1]=='R'&&a[i][pos+1]=='W')dp[i][1]=max(dp[i-1][0],dp[i-1][1])+1;
if(i-1>=0&&i+1<n&&a[i-1][pos]=='R'&&a[i+1][pos]=='W')dp[i][2]=max(dp[i-1][0],dp[i-1][2])+1;
}
int mx=0;
REP(i,0,n)mx=max(mx,*max_element(dp[i].begin(),dp[i].end()));
ans+=mx;
}
cout<<ans;
}
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