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Submission #1066038

# Submission time Handle Problem Language Result Execution time Memory
1066038 2024-08-19T14:19:25 Z belgianbot Mecho (IOI09_mecho) C++17
37 / 100
 220 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;
			for (int x : adj[u.se]) if (!pro[x] && (u.fi + 1) / S < dist[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
37.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 348 KB Output is correct
2 Correct 0 ms 348 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 380 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Runtime error 158 ms 65536 KB Execution killed with signal 9
8 Correct 0 ms 348 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 348 KB Output is correct
12 Incorrect 0 ms 604 KB Output isn't correct
13 Runtime error 220 ms 65536 KB Execution killed with signal 9
14 Runtime error 172 ms 65536 KB Execution killed with signal 9
15 Correct 1 ms 344 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 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 1 ms 348 KB Output is correct
25 Correct 0 ms 604 KB Output is correct
26 Correct 0 ms 604 KB Output is correct
27 Correct 0 ms 604 KB Output is correct
28 Correct 0 ms 604 KB Output is correct
29 Correct 1 ms 604 KB Output is correct
30 Correct 0 ms 604 KB Output is correct
31 Correct 1 ms 604 KB Output is correct
32 Correct 0 ms 604 KB Output is correct
33 Correct 6 ms 5760 KB Output is correct
34 Correct 6 ms 5720 KB Output is correct
35 Runtime error 167 ms 65536 KB Execution killed with signal 9
36 Correct 8 ms 7512 KB Output is correct
37 Correct 8 ms 7500 KB Output is correct
38 Runtime error 160 ms 65536 KB Execution killed with signal 9
39 Correct 10 ms 9308 KB Output is correct
40 Correct 9 ms 9280 KB Output is correct
41 Runtime error 159 ms 65536 KB Execution killed with signal 9
42 Correct 20 ms 11356 KB Output is correct
43 Correct 11 ms 11520 KB Output is correct
44 Runtime error 161 ms 65536 KB Execution killed with signal 9
45 Correct 17 ms 13660 KB Output is correct
46 Correct 15 ms 13800 KB Output is correct
47 Runtime error 152 ms 65536 KB Execution killed with signal 9
48 Correct 25 ms 16216 KB Output is correct
49 Correct 17 ms 16216 KB Output is correct
50 Runtime error 151 ms 65536 KB Execution killed with signal 9
51 Correct 21 ms 19036 KB Output is correct
52 Correct 22 ms 19036 KB Output is correct
53 Runtime error 165 ms 65536 KB Execution killed with signal 9
54 Correct 27 ms 22108 KB Output is correct
55 Correct 25 ms 22068 KB Output is correct
56 Runtime error 154 ms 65536 KB Execution killed with signal 9
57 Correct 41 ms 25168 KB Output is correct
58 Correct 29 ms 25176 KB Output is correct
59 Runtime error 150 ms 65536 KB Execution killed with signal 9
60 Correct 34 ms 28756 KB Output is correct
61 Correct 30 ms 28720 KB Output is correct
62 Runtime error 146 ms 65536 KB Execution killed with signal 9
63 Correct 100 ms 30712 KB Output is correct
64 Correct 165 ms 30656 KB Output is correct
65 Correct 120 ms 30724 KB Output is correct
66 Correct 113 ms 30544 KB Output is correct
67 Correct 96 ms 30548 KB Output is correct
68 Correct 81 ms 30676 KB Output is correct
69 Correct 67 ms 30552 KB Output is correct
70 Correct 66 ms 30544 KB Output is correct
71 Correct 73 ms 30680 KB Output is correct
72 Incorrect 59 ms 30672 KB Output isn't correct
73 Runtime error 157 ms 65536 KB Execution killed with signal 9
74 Runtime error 158 ms 65536 KB Execution killed with signal 9
75 Runtime error 158 ms 65536 KB Execution killed with signal 9
76 Runtime error 170 ms 65536 KB Execution killed with signal 9
77 Runtime error 157 ms 65536 KB Execution killed with signal 9
78 Runtime error 148 ms 65536 KB Execution killed with signal 9
79 Runtime error 156 ms 65536 KB Execution killed with signal 9
80 Runtime error 148 ms 65536 KB Execution killed with signal 9
81 Runtime error 148 ms 65536 KB Execution killed with signal 9
82 Runtime error 152 ms 65536 KB Execution killed with signal 9
83 Runtime error 169 ms 65536 KB Execution killed with signal 9
84 Runtime error 150 ms 65536 KB Execution killed with signal 9
85 Runtime error 169 ms 65536 KB Execution killed with signal 9
86 Runtime error 160 ms 65536 KB Execution killed with signal 9
87 Runtime error 157 ms 65536 KB Execution killed with signal 9
88 Runtime error 147 ms 65536 KB Execution killed with signal 9
89 Runtime error 153 ms 65536 KB Execution killed with signal 9
90 Runtime error 154 ms 65536 KB Execution killed with signal 9
91 Runtime error 150 ms 65536 KB Execution killed with signal 9
92 Runtime error 150 ms 65536 KB Execution killed with signal 9