#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef double ld;
#define pb push_back
#define sz(x) int(x.size())
#define all(x) x.begin(),x.end()
#define F first
#define S second
const int N = 4002;
int n, m, ans = 1;
char c[N][N];
bool fc[N][N];
int dx[] = {1, -1, 0, 0};
int dy[] = {0, 0, 1, -1};
vector<pair<int, int>> f, r;
bool vis[N][N];
void dfs(int i, int j) {
fc[i][j] = true;
vis[i][j] = true;
for (int ii = 0; ii < 4; ii++) {
int nx = i + dx[ii], ny = j + dy[ii];
if (nx < 0 || ny < 0 || nx >= n || ny >= m)continue;
if (c[nx][ny] == c[0][0]) {
if (!fc[nx][ny])dfs(nx, ny);
} else if (!vis[nx][ny]) {
if (c[nx][ny] == 'F')f.pb({nx, ny});
else if (c[nx][ny] == 'R')r.pb({nx, ny});
vis[nx][ny] = true;
}
}
}
int main () {
ios::sync_with_stdio(false);
cin.tie(nullptr);
cin >> n >> m;
if (max(n, m) > 4000)while (1);
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
cin >> c[i][j];
}
}
dfs(0, 0);
char cur = 'R';
if (c[0][0] == cur)cur = 'F';
while (!f.empty() || !r.empty()) {
if (cur == 'R') {
if (!r.empty())ans++;
while (!r.empty()) {
int x = r.back().F, y = r.back().S;
r.pop_back();
for (int i = 0; i < 4; i++) {
int nx = x + dx[i], ny = y + dy[i];
if (nx < 0 || ny < 0 || nx >= n || ny >= m)continue;
if (vis[nx][ny])continue;
vis[nx][ny] = true;
if (c[nx][ny] == 'R')r.pb({nx, ny});
else if (c[nx][ny] == 'F')f.pb({nx, ny});
}
}
} else {
if (!f.empty()) {
ans++;
}
while (!f.empty()) {
int x = f.back().F, y = f.back().S;
f.pop_back();
for (int i = 0; i < 4; i++) {
int nx = x + dx[i], ny = y + dy[i];
if (nx < 0 || ny < 0 || nx >= n || ny >= m)continue;
if (vis[nx][ny])continue;
vis[nx][ny] = true;
if (c[nx][ny] == 'R')r.pb({nx, ny});
else if (c[nx][ny] == 'F')f.pb({nx, ny});
}
}
}
if (cur == 'F')cur = 'R';
else cur = 'F';
}
cout << ans;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
10 ms |
10076 KB |
Output is correct |
| 2 |
Correct |
1 ms |
4444 KB |
Output is correct |
| 3 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 4 |
Correct |
8 ms |
11228 KB |
Output is correct |
| 5 |
Correct |
2 ms |
5724 KB |
Output is correct |
| 6 |
Correct |
1 ms |
4444 KB |
Output is correct |
| 7 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 8 |
Correct |
1 ms |
6748 KB |
Output is correct |
| 9 |
Correct |
1 ms |
6748 KB |
Output is correct |
| 10 |
Correct |
2 ms |
5468 KB |
Output is correct |
| 11 |
Correct |
2 ms |
7128 KB |
Output is correct |
| 12 |
Correct |
4 ms |
7004 KB |
Output is correct |
| 13 |
Correct |
3 ms |
5964 KB |
Output is correct |
| 14 |
Correct |
3 ms |
5724 KB |
Output is correct |
| 15 |
Correct |
9 ms |
9564 KB |
Output is correct |
| 16 |
Correct |
9 ms |
10076 KB |
Output is correct |
| 17 |
Correct |
7 ms |
9564 KB |
Output is correct |
| 18 |
Correct |
6 ms |
11232 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
10 ms |
46684 KB |
Output is correct |
| 2 |
Correct |
35 ms |
17632 KB |
Output is correct |
| 3 |
Correct |
229 ms |
48080 KB |
Output is correct |
| 4 |
Correct |
60 ms |
24904 KB |
Output is correct |
| 5 |
Correct |
173 ms |
38624 KB |
Output is correct |
| 6 |
Correct |
489 ms |
101980 KB |
Output is correct |
| 7 |
Correct |
13 ms |
47704 KB |
Output is correct |
| 8 |
Correct |
10 ms |
46684 KB |
Output is correct |
| 9 |
Correct |
2 ms |
4956 KB |
Output is correct |
| 10 |
Correct |
1 ms |
4956 KB |
Output is correct |
| 11 |
Correct |
10 ms |
47316 KB |
Output is correct |
| 12 |
Correct |
1 ms |
6748 KB |
Output is correct |
| 13 |
Correct |
35 ms |
17632 KB |
Output is correct |
| 14 |
Correct |
25 ms |
12888 KB |
Output is correct |
| 15 |
Correct |
17 ms |
16128 KB |
Output is correct |
| 16 |
Correct |
16 ms |
7004 KB |
Output is correct |
| 17 |
Correct |
86 ms |
28100 KB |
Output is correct |
| 18 |
Correct |
66 ms |
28228 KB |
Output is correct |
| 19 |
Correct |
57 ms |
24920 KB |
Output is correct |
| 20 |
Correct |
55 ms |
25324 KB |
Output is correct |
| 21 |
Correct |
135 ms |
40920 KB |
Output is correct |
| 22 |
Correct |
164 ms |
38740 KB |
Output is correct |
| 23 |
Correct |
163 ms |
32728 KB |
Output is correct |
| 24 |
Correct |
142 ms |
41044 KB |
Output is correct |
| 25 |
Correct |
259 ms |
48188 KB |
Output is correct |
| 26 |
Runtime error |
699 ms |
1048576 KB |
Execution killed with signal 9 |
| 27 |
Correct |
609 ms |
358204 KB |
Output is correct |
| 28 |
Correct |
494 ms |
103212 KB |
Output is correct |
| 29 |
Correct |
486 ms |
109612 KB |
Output is correct |
| 30 |
Correct |
474 ms |
108752 KB |
Output is correct |
| 31 |
Correct |
330 ms |
42764 KB |
Output is correct |
| 32 |
Correct |
380 ms |
66368 KB |
Output is correct |
