#include <bits/stdc++.h>
using namespace std;
#define int long long
#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define foru(i, l, r) for(int i = l; i <= r; i++)
#define ford(i, r, l) for(int i = r; i >= l; i--)
#define __TIME (1.0 * clock() / CLOCKS_PER_SEC)
typedef pair<int, int> ii;
typedef pair<ii, int> iii;
typedef pair<ii, ii> iiii;
const int N = 3000 + 5;
const int oo = 1e18, mod = 1e9 + 7;
int n, m, k, ans=0, dp[2*N][5];
int a[N][N]; // R G W
void process() {
foru(tmp, 1, n+m) {
memset(dp, 0, sizeof(dp));
int i=1, j=tmp-1, cnt=1;
while (i<=n && j>=1) {
if (j>m) {
i++; j--; continue;
}
dp[cnt][0]=max(dp[cnt-1][0], max(dp[cnt-1][1], dp[cnt-1][2]));
if (a[i][j-1]==0 && a[i][j]==1 && a[i][j+1]==2) dp[cnt][1]=max(dp[cnt-1][0], dp[cnt-1][1])+1;
if (a[i-1][j]==0 && a[i][j]==1 && a[i+1][j]==2) dp[cnt][2]=max(dp[cnt-1][0], dp[cnt-1][2])+1;
i++; j--;
cnt++;
}
cnt--;
ans+=max(dp[cnt][0], max(dp[cnt][1], dp[cnt][2]));
//cout << dp[cnt][0] << ' ' << dp[cnt][1] << ' ' << dp[cnt][2] << '\n';
}
cout << ans << '\n';
return;
}
signed main() {
cin.tie(0)->sync_with_stdio(false);
//freopen(".inp", "r", stdin);
//freopen(".out", "w", stdout);
cin >> n >> m;
foru(i, 1, n) foru(j, 1, m) {
char x;
cin >> x;
if (x == 'R') a[i][j]=0;
else if (x=='G') a[i][j]=1;
else if (x=='W') a[i][j]=2;
}
process();
cerr << "Time elapsed: " << __TIME << " s.\n";
return 0;
}
/*
Xét các trường hợp đặc biệt
Kiểm tra lại input/output
Cố gắng trâu
Lật ngược bài toán
Calm down and get VOI
Stream of thought:
dp
*/
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
604 KB |
Output is correct |
2 |
Correct |
0 ms |
604 KB |
Output is correct |
3 |
Correct |
0 ms |
604 KB |
Output is correct |
4 |
Correct |
0 ms |
604 KB |
Output is correct |
5 |
Incorrect |
0 ms |
468 KB |
Output isn't correct |
6 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
604 KB |
Output is correct |
2 |
Correct |
0 ms |
604 KB |
Output is correct |
3 |
Correct |
0 ms |
604 KB |
Output is correct |
4 |
Correct |
0 ms |
604 KB |
Output is correct |
5 |
Incorrect |
0 ms |
468 KB |
Output isn't correct |
6 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
604 KB |
Output is correct |
2 |
Correct |
0 ms |
604 KB |
Output is correct |
3 |
Correct |
0 ms |
604 KB |
Output is correct |
4 |
Correct |
0 ms |
604 KB |
Output is correct |
5 |
Incorrect |
0 ms |
468 KB |
Output isn't correct |
6 |
Halted |
0 ms |
0 KB |
- |