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Submission #1065973

# Submission time Handle Problem Language Result Execution time Memory
1065973 2024-08-19T13:45:11 Z belgianbot Mecho (IOI09_mecho) C++17
30 / 100
 216 ms 65540 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<vector<char>> grid(N, vector<char>(N));
	
	for (int i = 0; i < N; i++) {
		for (int j = 0; j < N; j++) cin >> grid[i][j];
	}
	
	int start, end;
	vector<int> dist(N * N, INT_MAX);
	vector<vector<int>> adj(N * N);
	vector<int> hives;
	for (int i = 0; i < N; i++) {
		for (int j = 0; j < N; j++) {
			if (grid[i][j] == 'H') {
				hives.push_back(i * N + j);
				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] != 'G' && grid[i][j] != 'D') 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);
		}
	}
	
	
	int cnt = 1;
	while (!hives.empty()) {
		vector<int> newHives;
		for (int x : hives) {
			for (int y : adj[x]) {
				if (dist[y] != INT_MAX) continue;
				dist[y] = cnt;
				newHives.push_back(y);
			}
		}
		cnt++;
		swap(hives, newHives);
	}
	
	int l = 1, r = N * N;
	while (l <= r) {
		int mid = l + (r - l) / 2;
		vector<bool> pro(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:61:4: warning: 'end' may be used uninitialized in this function [-Wmaybe-uninitialized]
   61 |    if (u.se == end) {
      |    ^~

Subtask #1
30.0 / 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 1 ms 348 KB Output is correct
4 Correct 0 ms 452 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 152 ms 65536 KB Execution killed with signal 9
8 Incorrect 1 ms 344 KB Output isn't 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 216 ms 65536 KB Execution killed with signal 9
14 Runtime error 168 ms 65536 KB Execution killed with signal 9
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 1 ms 604 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 344 KB Output is correct
21 Correct 1 ms 348 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 1 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 1 ms 604 KB Output is correct
28 Correct 1 ms 604 KB Output is correct
29 Correct 1 ms 604 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 604 KB Output is correct
33 Correct 9 ms 5980 KB Output is correct
34 Correct 9 ms 5980 KB Output is correct
35 Runtime error 165 ms 65536 KB Execution killed with signal 9
36 Correct 11 ms 7512 KB Output is correct
37 Correct 12 ms 7512 KB Output is correct
38 Runtime error 152 ms 65536 KB Execution killed with signal 9
39 Correct 14 ms 9560 KB Output is correct
40 Correct 14 ms 9560 KB Output is correct
41 Runtime error 154 ms 65536 KB Execution killed with signal 9
42 Correct 19 ms 11612 KB Output is correct
43 Correct 18 ms 11736 KB Output is correct
44 Runtime error 148 ms 65536 KB Execution killed with signal 9
45 Correct 26 ms 13912 KB Output is correct
46 Correct 21 ms 14064 KB Output is correct
47 Runtime error 175 ms 65536 KB Execution killed with signal 9
48 Correct 27 ms 16728 KB Output is correct
49 Correct 26 ms 16728 KB Output is correct
50 Runtime error 154 ms 65536 KB Execution killed with signal 9
51 Correct 29 ms 19536 KB Output is correct
52 Correct 31 ms 19544 KB Output is correct
53 Runtime error 148 ms 65536 KB Execution killed with signal 9
54 Correct 33 ms 22356 KB Output is correct
55 Correct 33 ms 22352 KB Output is correct
56 Runtime error 158 ms 65536 KB Execution killed with signal 9
57 Correct 37 ms 25692 KB Output is correct
58 Correct 40 ms 25688 KB Output is correct
59 Runtime error 148 ms 65536 KB Execution killed with signal 9
60 Correct 42 ms 29264 KB Output is correct
61 Correct 43 ms 29376 KB Output is correct
62 Runtime error 138 ms 65536 KB Execution killed with signal 9
63 Correct 99 ms 31064 KB Output is correct
64 Correct 179 ms 31060 KB Output is correct
65 Correct 134 ms 31232 KB Output is correct
66 Correct 116 ms 31228 KB Output is correct
67 Incorrect 107 ms 31056 KB Output isn't correct
68 Correct 75 ms 31060 KB Output is correct
69 Correct 71 ms 31060 KB Output is correct
70 Correct 68 ms 31304 KB Output is correct
71 Correct 85 ms 31292 KB Output is correct
72 Incorrect 69 ms 31312 KB Output isn't correct
73 Runtime error 147 ms 65536 KB Execution killed with signal 9
74 Runtime error 146 ms 65536 KB Execution killed with signal 9
75 Runtime error 203 ms 65536 KB Execution killed with signal 9
76 Runtime error 153 ms 65536 KB Execution killed with signal 9
77 Runtime error 147 ms 65536 KB Execution killed with signal 9
78 Runtime error 143 ms 65536 KB Execution killed with signal 9
79 Runtime error 145 ms 65536 KB Execution killed with signal 9
80 Runtime error 151 ms 65536 KB Execution killed with signal 9
81 Runtime error 177 ms 65536 KB Execution killed with signal 9
82 Runtime error 148 ms 65536 KB Execution killed with signal 9
83 Runtime error 145 ms 65536 KB Execution killed with signal 9
84 Runtime error 156 ms 65540 KB Execution killed with signal 9
85 Runtime error 144 ms 65536 KB Execution killed with signal 9
86 Runtime error 153 ms 65536 KB Execution killed with signal 9
87 Runtime error 149 ms 65536 KB Execution killed with signal 9
88 Runtime error 146 ms 65536 KB Execution killed with signal 9
89 Runtime error 149 ms 65536 KB Execution killed with signal 9
90 Runtime error 148 ms 65536 KB Execution killed with signal 9
91 Runtime error 157 ms 65536 KB Execution killed with signal 9
92 Runtime error 149 ms 65536 KB Execution killed with signal 9