oj.uz

Submission #1066031

# Submission time Handle Problem Language Result Execution time Memory
1066031 2024-08-19T14:15:30 Z belgianbot Mecho (IOI09_mecho) C++17
45 / 100
 244 ms 65536 KB 
#include <bits/stdc++.h>
#define se second
#define fi first

using namespace std;

signed main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	int N, S; cin >> N >> S;
	vector<string> grid(N);
	
	for (int i = 0; i < N; i++) {
		cin >> grid[i];
	}
	
	int start, end;
	vector<int> dist(N * N, INT_MAX);
	vector<vector<int>> adj(N * N);
	queue<pair<int,int>> hives;
	for (int i = 0; i < N; i++) {
		for (int j = 0; j < N; j++) {
			if (grid[i][j] == 'H') {
				hives.push({i * N + j, 1});
				dist[i * N + j] = 0;
			}
			else if (grid[i][j] == 'M') start = i * N + j;
			else if (grid[i][j] == 'D') end = i * N + j;
			if (grid[i][j] == 'H' || grid[i][j] == 'T') continue;
			if (i && (grid[i - 1][j] == 'D' || grid[i - 1][j] == 'H' || grid[i - 1][j] == 'M' || grid[i - 1][j] == 'G')) adj[i * N - N + j].push_back(i * N + j);
			if (j && (grid[i][j-1] == 'D' || grid[i][j-1] == 'H' || grid[i][j-1] == 'M' || grid[i][j-1] == 'G')) adj[i * N + j-1].push_back(i * N + j);
			if (i != N - 1 && (grid[i + 1][j] == 'D' || grid[i + 1][j] == 'H' || grid[i + 1][j] == 'M' || grid[i + 1][j] == 'G')) adj[i * N + N + j].push_back(i * N + j);
			if (j != N - 1 && (grid[i][j+1] == 'D' || grid[i][j+1] == 'H' || grid[i][j+1] == 'M' || grid[i][j+1] == 'G')) adj[i * N + j+1].push_back(i * N + j);
		}
	}
	
	
	while (!hives.empty()) {
		auto x = hives.front(); hives.pop();
		for (int y : adj[x.fi]) {
			if (dist[y] == INT_MAX && grid[y / N][y % N] != 'D'){
				hives.push({y, x.se + 1});
				dist[y] = x.se;
			}
		}
	}
	vector<bool> pro;
	int l = 0, r = N * N / 2 + N;
	while (l <= r) {
		int mid = l + (r - l) / 2;
		pro.clear(); pro.resize(N * N, false);
		queue<pair<int,int>> q;
		q.push({mid * S, start});
		bool won = false;
		while (!q.empty()) {
			auto u = q.front(); q.pop();
			if (u.se == end) {
				won = true;
				break;
			}
			pro[u.se] = true;
			if (u.fi / S >= dist[u.se]) continue;
			for (int x : adj[u.se]) if (!pro[x]) q.push({u.fi + 1, x});
		}

		if (won) l = mid + 1;
		else r = mid - 1;
	}
	
	cout << l - 1 << '\n';
	return 0;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:57:4: warning: 'end' may be used uninitialized in this function [-Wmaybe-uninitialized]
   57 |    if (u.se == end) {
      |    ^~

Subtask #1
45.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 604 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Runtime error 148 ms 65536 KB Execution killed with signal 9
8 Correct 0 ms 344 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 460 KB Output is correct
12 Correct 1 ms 604 KB Output is correct
13 Runtime error 244 ms 65536 KB Execution killed with signal 9
14 Runtime error 171 ms 65536 KB Execution killed with signal 9
15 Correct 0 ms 344 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 392 KB Output is correct
18 Correct 1 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 604 KB Output is correct
26 Correct 1 ms 604 KB Output is correct
27 Correct 0 ms 604 KB Output is correct
28 Correct 1 ms 604 KB Output is correct
29 Correct 1 ms 856 KB Output is correct
30 Correct 1 ms 604 KB Output is correct
31 Correct 1 ms 604 KB Output is correct
32 Correct 1 ms 716 KB Output is correct
33 Correct 7 ms 5964 KB Output is correct
34 Correct 6 ms 5976 KB Output is correct
35 Runtime error 156 ms 65536 KB Execution killed with signal 9
36 Correct 10 ms 7516 KB Output is correct
37 Correct 15 ms 7516 KB Output is correct
38 Runtime error 162 ms 65536 KB Execution killed with signal 9
39 Correct 12 ms 9816 KB Output is correct
40 Correct 11 ms 9564 KB Output is correct
41 Runtime error 166 ms 65536 KB Execution killed with signal 9
42 Correct 13 ms 11612 KB Output is correct
43 Correct 12 ms 11788 KB Output is correct
44 Runtime error 164 ms 65536 KB Execution killed with signal 9
45 Correct 15 ms 13916 KB Output is correct
46 Correct 14 ms 14168 KB Output is correct
47 Runtime error 150 ms 65536 KB Execution killed with signal 9
48 Correct 18 ms 16732 KB Output is correct
49 Correct 17 ms 16732 KB Output is correct
50 Runtime error 160 ms 65536 KB Execution killed with signal 9
51 Correct 22 ms 19548 KB Output is correct
52 Correct 24 ms 19548 KB Output is correct
53 Runtime error 154 ms 65536 KB Execution killed with signal 9
54 Correct 26 ms 22612 KB Output is correct
55 Correct 27 ms 22616 KB Output is correct
56 Runtime error 162 ms 65536 KB Execution killed with signal 9
57 Correct 34 ms 25856 KB Output is correct
58 Correct 33 ms 25768 KB Output is correct
59 Runtime error 144 ms 65536 KB Execution killed with signal 9
60 Correct 33 ms 29264 KB Output is correct
61 Correct 34 ms 29268 KB Output is correct
62 Runtime error 144 ms 65536 KB Execution killed with signal 9
63 Correct 97 ms 31344 KB Output is correct
64 Correct 161 ms 31308 KB Output is correct
65 Correct 138 ms 31324 KB Output is correct
66 Correct 106 ms 31312 KB Output is correct
67 Correct 97 ms 31312 KB Output is correct
68 Correct 75 ms 31308 KB Output is correct
69 Correct 66 ms 31316 KB Output is correct
70 Correct 69 ms 31300 KB Output is correct
71 Correct 69 ms 31316 KB Output is correct
72 Correct 67 ms 31308 KB Output is correct
73 Runtime error 162 ms 65536 KB Execution killed with signal 9
74 Runtime error 161 ms 65536 KB Execution killed with signal 9
75 Runtime error 155 ms 65536 KB Execution killed with signal 9
76 Runtime error 159 ms 65536 KB Execution killed with signal 9
77 Runtime error 151 ms 65536 KB Execution killed with signal 9
78 Runtime error 173 ms 65536 KB Execution killed with signal 9
79 Runtime error 146 ms 65536 KB Execution killed with signal 9
80 Runtime error 144 ms 65536 KB Execution killed with signal 9
81 Runtime error 152 ms 65536 KB Execution killed with signal 9
82 Runtime error 158 ms 65536 KB Execution killed with signal 9
83 Runtime error 147 ms 65536 KB Execution killed with signal 9
84 Runtime error 156 ms 65536 KB Execution killed with signal 9
85 Runtime error 146 ms 65536 KB Execution killed with signal 9
86 Runtime error 146 ms 65536 KB Execution killed with signal 9
87 Runtime error 147 ms 65536 KB Execution killed with signal 9
88 Runtime error 144 ms 65536 KB Execution killed with signal 9
89 Runtime error 143 ms 65536 KB Execution killed with signal 9
90 Runtime error 143 ms 65536 KB Execution killed with signal 9
91 Runtime error 148 ms 65536 KB Execution killed with signal 9
92 Runtime error 144 ms 65536 KB Execution killed with signal 9