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Submission #958033

# Submission time Handle Problem Language Result Execution time Memory
958033 2024-04-04T17:34:25 Z theehann Mecho (IOI09_mecho) C++17
69 / 100
 157 ms 7764 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define int ll
#define ft first
#define se second
#define NAME "A"
#define file freopen(NAME".INP","r",stdin); freopen(NAME".OUT","w",stdout);
#define sdf ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
const int MOD = 1e9 + 7;
const int N = 800 + 5, INF = 1e15;
int dx[4] = {0, 0, -1, 1};
int dy[4] = {-1, 1, 0, 0};
char a[N][N];
int dis[N][N];
bool f = false, vis[N][N] = {false};
int n, step, homex, homey, mx, my;

bool bfs(int len, int x, int y){
	vis[x][y] = true;
	queue<tuple<int, int, int>> q;
	q.push({x, y, len});
	while(!q.empty()){
		const auto [sx, sy, cur] = q.front(); q.pop();
		int dist = (cur + 1) / step;

		for(int i = 0;i < 4;++i){
			int u = sx + dx[i], v = sy + dy[i];
			if(u < 1 || v < 1 || v > n || u > n) continue;
			if(a[u][v] == 'G' && !vis[u][v] && dist < dis[u][v]){
				vis[u][v] = true;
				q.push({u, v, cur + 1});
			}
		}
	}

	for(int i = 0;i < 4;++i){
		int u = homex + dx[i], v = homey + dy[i];
		if(vis[u][v] && a[u][v] == 'G'){
			return true;
		}
	}
	return false;
}

int32_t main(){
	sdf

	cin >> n >> step;
	queue<pair<int, int>> q;
	for(int i = 1;i <= n;++i){
		for(int j = 1;j <= n;++j){
			cin >> a[i][j];
			dis[i][j] = INF;
			if(a[i][j] == 'H'){
				q.push({i, j});
				dis[i][j] = 0;
			}
			else if(a[i][j] == 'D'){
				homex = i; homey = j;
			}
			else if(a[i][j] == 'M'){
				mx = i; my = j;
			}
		}
	}

	while(!q.empty()){
		const auto [x, y] = q.front(); q.pop();

		for(int i  = 0;i < 4;++i){
			int u = x + dx[i];
			int v = y + dy[i];
			if(u < 1 || v < 1 || u > n || v > n) continue;
			if(dis[u][v] == INF && a[u][v] == 'G'){
				dis[u][v] = dis[x][y] + 1;
				q.push({u, v});
			}
		}
	}

	int l = 1, r = INF;
	int ans =0;
	while(l <= r){
		int mid = (l + r) / 2;
		memset(vis, false, sizeof(vis));
		if(bfs(mid * step, mx, my)){
			l = mid + 1;
			ans = mid;
		}
		else{
			r = mid - 1;
		}
	}
	cout << ((ans >= 1) ? ans : -1) ;
	
	return 0;
}

Subtask #1
69.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4696 KB Output is correct
2 Correct 1 ms 4696 KB Output is correct
3 Correct 1 ms 4696 KB Output is correct
4 Correct 1 ms 4564 KB Output is correct
5 Incorrect 1 ms 4696 KB Output isn't correct
6 Correct 1 ms 4696 KB Output is correct
7 Correct 60 ms 7056 KB Output is correct
8 Correct 2 ms 4696 KB Output is correct
9 Correct 2 ms 4696 KB Output is correct
10 Correct 2 ms 4696 KB Output is correct
11 Correct 2 ms 4700 KB Output is correct
12 Incorrect 1 ms 4700 KB Output isn't correct
13 Incorrect 2 ms 4696 KB Output isn't correct
14 Correct 1 ms 4700 KB Output is correct
15 Correct 1 ms 4700 KB Output is correct
16 Correct 2 ms 4700 KB Output is correct
17 Correct 2 ms 4700 KB Output is correct
18 Correct 2 ms 4700 KB Output is correct
19 Correct 2 ms 4700 KB Output is correct
20 Correct 1 ms 4564 KB Output is correct
21 Correct 2 ms 4700 KB Output is correct
22 Correct 1 ms 4700 KB Output is correct
23 Correct 2 ms 4700 KB Output is correct
24 Correct 1 ms 4700 KB Output is correct
25 Correct 2 ms 4700 KB Output is correct
26 Correct 1 ms 4952 KB Output is correct
27 Correct 2 ms 4700 KB Output is correct
28 Correct 2 ms 4700 KB Output is correct
29 Correct 1 ms 4700 KB Output is correct
30 Correct 2 ms 4700 KB Output is correct
31 Correct 2 ms 4900 KB Output is correct
32 Correct 2 ms 4700 KB Output is correct
33 Correct 4 ms 6748 KB Output is correct
34 Correct 4 ms 6748 KB Output is correct
35 Correct 22 ms 6696 KB Output is correct
36 Correct 5 ms 6748 KB Output is correct
37 Correct 5 ms 6748 KB Output is correct
38 Correct 19 ms 6748 KB Output is correct
39 Correct 6 ms 6748 KB Output is correct
40 Correct 8 ms 6828 KB Output is correct
41 Correct 24 ms 6748 KB Output is correct
42 Correct 6 ms 6792 KB Output is correct
43 Correct 6 ms 6748 KB Output is correct
44 Correct 36 ms 6820 KB Output is correct
45 Correct 7 ms 6748 KB Output is correct
46 Correct 7 ms 6824 KB Output is correct
47 Correct 40 ms 7004 KB Output is correct
48 Correct 8 ms 7004 KB Output is correct
49 Correct 10 ms 7020 KB Output is correct
50 Correct 48 ms 7004 KB Output is correct
51 Correct 11 ms 6876 KB Output is correct
52 Correct 10 ms 7000 KB Output is correct
53 Correct 52 ms 7004 KB Output is correct
54 Correct 10 ms 7004 KB Output is correct
55 Correct 10 ms 7004 KB Output is correct
56 Correct 61 ms 7120 KB Output is correct
57 Correct 11 ms 7004 KB Output is correct
58 Correct 11 ms 7004 KB Output is correct
59 Correct 72 ms 7004 KB Output is correct
60 Correct 14 ms 7200 KB Output is correct
61 Correct 18 ms 7144 KB Output is correct
62 Correct 84 ms 7208 KB Output is correct
63 Incorrect 69 ms 7188 KB Output isn't correct
64 Correct 157 ms 6980 KB Output is correct
65 Correct 128 ms 7052 KB Output is correct
66 Correct 94 ms 7168 KB Output is correct
67 Correct 82 ms 7200 KB Output is correct
68 Incorrect 34 ms 7252 KB Output isn't correct
69 Correct 46 ms 7292 KB Output is correct
70 Correct 32 ms 7256 KB Output is correct
71 Correct 25 ms 7100 KB Output is correct
72 Incorrect 32 ms 7252 KB Output isn't correct
73 Incorrect 45 ms 7512 KB Output isn't correct
74 Correct 43 ms 7688 KB Output is correct
75 Correct 48 ms 7764 KB Output is correct
76 Correct 42 ms 7512 KB Output is correct
77 Correct 43 ms 7720 KB Output is correct
78 Correct 48 ms 7484 KB Output is correct
79 Correct 47 ms 7620 KB Output is correct
80 Correct 56 ms 7508 KB Output is correct
81 Correct 47 ms 7504 KB Output is correct
82 Correct 42 ms 7508 KB Output is correct
83 Incorrect 48 ms 7516 KB Output isn't correct
84 Correct 45 ms 7256 KB Output is correct
85 Correct 48 ms 7456 KB Output is correct
86 Correct 52 ms 7564 KB Output is correct
87 Correct 50 ms 7632 KB Output is correct
88 Incorrect 62 ms 7364 KB Output isn't correct
89 Correct 65 ms 7504 KB Output is correct
90 Correct 57 ms 7544 KB Output is correct
91 Correct 48 ms 7504 KB Output is correct
92 Correct 58 ms 7504 KB Output is correct