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;
#define int int64_t
#define ld long double
#define ar array
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int MOD = 1e9+7;
const int INF = 1e15+5;
void amax(int &a, int b) { a = max(a, b); }
void solve() {
int N, M; cin >> N >> M;
string s[N];
for (string &i : s) cin >> i;
auto right = [&](int i, int j) {
if (j + 2 >= M) return false;
return s[i][j] == 'R' && s[i][j+1] == 'G' && s[i][j+2] == 'W';
};
auto down = [&](int i, int j) {
if (i + 2 >= N) return false;
return s[i][j] == 'R' && s[i+1][j] == 'G' && s[i+2][j] == 'W';
};
int ans = 0;
for (int x = 0; x < N; x++) {
vector<ar<int,3>> dp(M, {0,0,0});
if (down(x, 0)) dp[0][1] = dp[0][0] = 1;
if (right(x, 0)) dp[0][2] = 1;
int mx = max({dp[0][0], dp[0][1], dp[0][2]});
cout << x << ' ' << 0 << " : ";
cout << dp[0][0] << ' ' << dp[0][1] << ' ' << dp[0][2] << '\n';
for (int i = x-1, j = 1; j < M && i >= 0; i--, j++) {
if (down(i, j))
amax(dp[j][1], dp[j-1][0] + 1);
if (right(i, j)) {
amax(dp[j][2], max(dp[j-1][0], dp[j-1][2]) + 1);
if (j - 2 >= 0) amax(dp[j][2], dp[j-2][2] + 1);
}
amax(dp[j][0], max(dp[j-1][0], dp[j][1]));
if (j - 2 >= 0) amax(dp[j][0], dp[j-2][2]);
amax(mx, max({dp[j][0], dp[j][1], dp[j][2]}));
}
ans += mx;
}
for (int x = 1; x < M; x++) {
vector<ar<int,3>> dp(M, {0,0,0});
if (down(N-1, x)) dp[x][1] = dp[x][0] = 1;
if (right(N-1, x)) dp[x][2] = 1;
int mx = max({dp[x][0], dp[x][1], dp[x][2]});
for (int i = N-2, j = x + 1; j < M && i >= 0; i--, j++) {
if (down(i, j))
amax(dp[j][1], dp[j-1][0] + 1);
if (right(i, j)) {
amax(dp[j][2], max(dp[j-1][0], dp[j-1][2]) + 1);
if (j - 2 >= 0) amax(dp[j][2], dp[j-2][2] + 1);
}
amax(dp[j][0], max(dp[j-1][0], dp[j][1]));
if (j - 2 >= 0) amax(dp[j][0], dp[j-2][2]);
amax(mx, max({dp[j][0], dp[j][1], dp[j][2]}));
}
ans += mx;
}
cout << ans << '\n';
}
int32_t main() {
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
int t = 1; //cin >> t;
while (t--) solve();
}
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