oj.uz

Submission #393545

# Submission time Handle Problem Language Result Execution time Memory
393545 2021-04-24T00:06:38 Z Genius3435 Tracks in the Snow (BOI13_tracks) C++17
100 / 100
 1029 ms 182728 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vi = vector<int>;
using pii = pair<int, int>;


#define F first
#define S second
#define allv(v) v.begin(), v.end()
#define alla(a, N) a, a + N

inline void fastIO() {
	cin.tie(nullptr) -> sync_with_stdio(false);
}



const int dx[4] = { 0,  1,  0, -1};
const int dy[4] = { 1,  0, -1,  0};


const int arraysize = 5005;
char grid[arraysize][arraysize];
bool vis[arraysize][arraysize];
int dis[arraysize][arraysize];


inline string YNEOS(bool b) {
	return b ? "YES" : "NO";
}

inline string YNeos(bool b) {
	return b ? "Yes" : "No";
}



void solve() {
	int N, M; cin >> N >> M;
	for (int i = 0; i < N; ++i)
		for (int j = 0; j < M; ++j)
			cin >> grid[i][j];
	
	int mx = 0;
	deque<pair<pii, int>> q;
	// {{i, j}, dis}
	q.emplace_front(pii{0, 0}, 1);
	dis[0][0] = 0, vis[0][0] = true;
	while (!q.empty()) {
		auto [p, d] = q.front();
		auto &[i, j] = p; q.pop_front();
		mx = max(mx, (dis[i][j] = d));

		for (int k = 0; k < 4; ++k) {
			int x = i + dx[k], y = j + dy[k];
			if (x < 0 || x >= N) continue;
			if (y < 0 || y >= M) continue;
			if (grid[x][y]=='.') continue;
			if (vis[x][y]==true) continue;

			vis[x][y] = true;
			if (grid[x][y] == grid[i][j])
				q.emplace_front(pii{x, y}, d);
			else q.emplace_back(pii{x, y}, d+1);
		}
	}

	cout << mx << '\n';
}



int main() {
	fastIO();
	solve();
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 7884 KB Output is correct
2 Correct 1 ms 464 KB Output is correct
3 Correct 1 ms 844 KB Output is correct
4 Correct 10 ms 7628 KB Output is correct
5 Correct 5 ms 4300 KB Output is correct
6 Correct 1 ms 460 KB Output is correct
7 Correct 1 ms 844 KB Output is correct
8 Correct 1 ms 1100 KB Output is correct
9 Correct 1 ms 1484 KB Output is correct
10 Correct 4 ms 3660 KB Output is correct
11 Correct 4 ms 3020 KB Output is correct
12 Correct 7 ms 4436 KB Output is correct
13 Correct 5 ms 4300 KB Output is correct
14 Correct 5 ms 4300 KB Output is correct
15 Correct 14 ms 7752 KB Output is correct
16 Correct 16 ms 7860 KB Output is correct
17 Correct 13 ms 7632 KB Output is correct
18 Correct 10 ms 7568 KB Output is correct

Subtask #2
70.0 / 70.0

# Verdict Execution time Memory Grader output
1 Correct 26 ms 46612 KB Output is correct
2 Correct 62 ms 22132 KB Output is correct
3 Correct 388 ms 99276 KB Output is correct
4 Correct 120 ms 43712 KB Output is correct
5 Correct 245 ms 70648 KB Output is correct
6 Correct 869 ms 154584 KB Output is correct
7 Correct 27 ms 48668 KB Output is correct
8 Correct 26 ms 46576 KB Output is correct
9 Correct 3 ms 716 KB Output is correct
10 Correct 1 ms 460 KB Output is correct
11 Correct 26 ms 47760 KB Output is correct
12 Correct 2 ms 2252 KB Output is correct
13 Correct 65 ms 22084 KB Output is correct
14 Correct 38 ms 15480 KB Output is correct
15 Correct 39 ms 18976 KB Output is correct
16 Correct 27 ms 8012 KB Output is correct
17 Correct 161 ms 40336 KB Output is correct
18 Correct 170 ms 47392 KB Output is correct
19 Correct 122 ms 43728 KB Output is correct
20 Correct 95 ms 35660 KB Output is correct
21 Correct 238 ms 70936 KB Output is correct
22 Correct 239 ms 70604 KB Output is correct
23 Correct 302 ms 58296 KB Output is correct
24 Correct 228 ms 67140 KB Output is correct
25 Correct 632 ms 133520 KB Output is correct
26 Correct 1029 ms 182728 KB Output is correct
27 Correct 882 ms 171428 KB Output is correct
28 Correct 822 ms 154584 KB Output is correct
29 Correct 818 ms 150880 KB Output is correct
30 Correct 856 ms 158336 KB Output is correct
31 Correct 601 ms 95300 KB Output is correct
32 Correct 945 ms 163476 KB Output is correct