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Submission #1002839

# Submission time Handle Problem Language Result Execution time Memory
1002839 2024-06-19T20:27:43 Z Tob Mecho (IOI09_mecho) C++14
100 / 100
 90 ms 7496 KB 
#include <bits/stdc++.h>

#define ll long long
#define F first
#define S second
#define all(x) x.begin(), x.end()
#define pb push_back
#define FIO ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)

using namespace std;

typedef pair <ll, ll> pii;

const int N = 807, inf = 1e9;
int dx[] = {0, 1, 0, -1};
int dy[] = {1, 0, -1, 0};

int n, S, stx, sty, enx, eny;
char mat[N][N];
int bee[N][N], bio[N][N];

int main () {
	FIO;
	cin >> n >> S;
	
	vector <pii> v;
	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= n; j++) {
			cin >> mat[i][j];
			if (mat[i][j] == 'M') stx = i, sty = j;
			if (mat[i][j] == 'D') enx = i, eny = j;
			if (mat[i][j] == 'H') v.pb({i, j});
		}
	}
	for (int i = 1; i <= n; i++) for (int j = 1; j <= n; j++) bee[i][j] = inf;
	for (int i = 0; i <= n+1; i++) bee[i][0] = bee[i][n+1] = bee[0][i] = bee[n+1][i] = -1;
	queue <pii> q;
	for (auto it : v) {
		q.push(it);
		bee[it.F][it.S] = 0;
	}
	while (!q.empty()) {
		pii fr = q.front(); q.pop();
		int x = fr.F, y = fr.S;
		for (int i = 0; i < 4; i++) {
			int nx = x + dx[i], ny = y + dy[i];
			if (bee[nx][ny] != inf) continue;
			if (mat[nx][ny] == 'T' || mat[nx][ny] == 'D') continue;
			bee[nx][ny] = bee[x][y] + 1;
			q.push({nx, ny});
		}
	}
	
	int lo = -1, hi = 1e8;
	while (!q.empty()) q.pop();
	while (lo < hi) {
		int mid = (lo + hi + 1) / 2;
		if (mid >= bee[stx][sty]) {
			hi = mid-1;
			continue;
		}
		memset(bio, -1, sizeof bio);
		for (int i = 0; i <= n+1; i++) bio[i][0] = bio[i][n+1] = bio[0][i] = bio[n+1][i] = -2;
		bio[stx][sty] = 0;
		q.push({stx, sty});
		while (!q.empty()) {
			pii fr = q.front(); q.pop();
			int x = fr.F, y = fr.S;
			int d = bio[x][y];
			for (int i = 0; i < 4; i++) {
				int nx = x + dx[i], ny = y + dy[i];
				if (bio[nx][ny] != -1) continue;
				if (mat[nx][ny] == 'T' || bee[nx][ny] <= mid+(d+1)/S) continue;
				bio[nx][ny] = d + 1;
				q.push({nx, ny});
			}
		}
		if (bio[enx][eny] == -1) hi = mid-1;
		else lo = mid;
	}
	cout << lo << "\n";

	return 0;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2908 KB Output is correct
2 Correct 1 ms 2908 KB Output is correct
3 Correct 2 ms 2908 KB Output is correct
4 Correct 1 ms 2908 KB Output is correct
5 Correct 1 ms 2908 KB Output is correct
6 Correct 1 ms 2908 KB Output is correct
7 Correct 37 ms 6800 KB Output is correct
8 Correct 1 ms 2908 KB Output is correct
9 Correct 1 ms 2908 KB Output is correct
10 Correct 1 ms 2908 KB Output is correct
11 Correct 1 ms 2908 KB Output is correct
12 Correct 1 ms 3164 KB Output is correct
13 Correct 1 ms 3160 KB Output is correct
14 Correct 2 ms 3164 KB Output is correct
15 Correct 1 ms 2908 KB Output is correct
16 Correct 1 ms 2908 KB Output is correct
17 Correct 1 ms 2908 KB Output is correct
18 Correct 2 ms 2908 KB Output is correct
19 Correct 1 ms 2908 KB Output is correct
20 Correct 1 ms 2908 KB Output is correct
21 Correct 2 ms 3164 KB Output is correct
22 Correct 2 ms 3164 KB Output is correct
23 Correct 2 ms 3164 KB Output is correct
24 Correct 2 ms 3164 KB Output is correct
25 Correct 2 ms 3164 KB Output is correct
26 Correct 2 ms 3160 KB Output is correct
27 Correct 2 ms 3160 KB Output is correct
28 Correct 1 ms 3164 KB Output is correct
29 Correct 1 ms 3164 KB Output is correct
30 Correct 2 ms 3300 KB Output is correct
31 Correct 2 ms 3280 KB Output is correct
32 Correct 2 ms 3164 KB Output is correct
33 Correct 6 ms 4440 KB Output is correct
34 Correct 5 ms 4440 KB Output is correct
35 Correct 11 ms 4440 KB Output is correct
36 Correct 5 ms 4700 KB Output is correct
37 Correct 5 ms 4700 KB Output is correct
38 Correct 16 ms 4700 KB Output is correct
39 Correct 6 ms 4956 KB Output is correct
40 Correct 5 ms 5000 KB Output is correct
41 Correct 20 ms 4956 KB Output is correct
42 Correct 7 ms 5208 KB Output is correct
43 Correct 6 ms 5216 KB Output is correct
44 Correct 24 ms 5212 KB Output is correct
45 Correct 8 ms 5464 KB Output is correct
46 Correct 7 ms 5468 KB Output is correct
47 Correct 26 ms 5464 KB Output is correct
48 Correct 8 ms 5724 KB Output is correct
49 Correct 9 ms 5500 KB Output is correct
50 Correct 31 ms 5724 KB Output is correct
51 Correct 10 ms 5764 KB Output is correct
52 Correct 10 ms 5980 KB Output is correct
53 Correct 40 ms 5980 KB Output is correct
54 Correct 11 ms 6232 KB Output is correct
55 Correct 11 ms 6236 KB Output is correct
56 Correct 41 ms 6236 KB Output is correct
57 Correct 11 ms 6532 KB Output is correct
58 Correct 12 ms 6528 KB Output is correct
59 Correct 52 ms 6528 KB Output is correct
60 Correct 14 ms 6744 KB Output is correct
61 Correct 12 ms 6748 KB Output is correct
62 Correct 54 ms 6828 KB Output is correct
63 Correct 57 ms 6748 KB Output is correct
64 Correct 80 ms 6748 KB Output is correct
65 Correct 90 ms 6748 KB Output is correct
66 Correct 75 ms 6996 KB Output is correct
67 Correct 69 ms 6796 KB Output is correct
68 Correct 29 ms 6744 KB Output is correct
69 Correct 28 ms 6740 KB Output is correct
70 Correct 24 ms 6748 KB Output is correct
71 Correct 23 ms 6636 KB Output is correct
72 Correct 20 ms 6632 KB Output is correct
73 Correct 21 ms 7236 KB Output is correct
74 Correct 34 ms 7348 KB Output is correct
75 Correct 36 ms 7204 KB Output is correct
76 Correct 36 ms 7260 KB Output is correct
77 Correct 37 ms 7252 KB Output is correct
78 Correct 42 ms 7260 KB Output is correct
79 Correct 35 ms 7260 KB Output is correct
80 Correct 35 ms 7096 KB Output is correct
81 Correct 39 ms 7164 KB Output is correct
82 Correct 37 ms 7496 KB Output is correct
83 Correct 36 ms 7000 KB Output is correct
84 Correct 37 ms 6996 KB Output is correct
85 Correct 36 ms 7260 KB Output is correct
86 Correct 41 ms 7020 KB Output is correct
87 Correct 41 ms 7004 KB Output is correct
88 Correct 40 ms 6996 KB Output is correct
89 Correct 45 ms 7128 KB Output is correct
90 Correct 45 ms 7004 KB Output is correct
91 Correct 45 ms 6992 KB Output is correct
92 Correct 45 ms 7004 KB Output is correct