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Submission #104310

# Submission time Handle Problem Language Result Execution time Memory
104310 2019-04-05T03:45:44 Z Badral Mecho (IOI09_mecho) C++17
100 / 100
 241 ms 4576 KB 
#include <bits/stdc++.h>
 
using namespace std;
 
const int maxn = 810;
 
typedef pair<int, int> pii;
 
int n, s, ox, oy, dx, dy;
int dist[maxn][maxn];
 
char tab[maxn][maxn];
 
bool mark[maxn][maxn];
 
int linha[] = {-1, 1, 0, 0};
int coluna[] = {0, 0, -1, 1};
 
void bfs(void)
{
	queue<pii> fila;
 
	for (int i = 1; i <= n; i++)
		for (int j = 1; j <= n; j++)
			if (tab[i][j] == 'H')
				dist[i][j] = 0, fila.push({i, j});
 
	dist[dx][dy] = 1e9+10;
 
	while (!fila.empty())
	{
		int x = fila.front().first, y = fila.front().second;
		fila.pop();
 
		for (int i = 0; i < 4; i++)
		{
			int a = x+linha[i], b = y+coluna[i];
			if (a < 1 || a > n || b < 1 || b > n || tab[a][b] == 'T' || tab[a][b] == 'D' || dist[a][b] != -1) continue;
 
			dist[a][b] = dist[x][y] + s;
			fila.push({a, b});
		}
	}
}
 
bool ok(int t)
{
	if (t*s >= dist[ox][oy]) return false;
 
	queue<pair<int, pii> > fila;
 
	memset(mark, 0, sizeof mark);
 
	mark[ox][oy] = 1;
	fila.push({t*s, {ox, oy}});
 
	while (!fila.empty())
	{
		int d = fila.front().first;
		int x = fila.front().second.first, y = fila.front().second.second;
		fila.pop();
 
		for (int i = 0; i < 4; i++)
		{
			int a = x+linha[i], b = y+coluna[i];
			if (a < 1 || a > n || b < 1 || b > n || tab[a][b] == 'T' || d+1 >= dist[a][b] || mark[a][b]) continue;
 
			if (tab[a][b] == 'D') return true;
 
			mark[a][b] = 1;
			fila.push({d+1, {a, b}});
		}
	}
 
	return false;
}
 
int busca(void)
{
	int ini = 0, fim = 640000*2, ans = -1;
 
	while (ini <= fim)
	{
		int mid = (ini+fim)>>1;
 
		if (ok(mid)) ini = mid+1, ans = mid;
		else fim = mid-1;
	}
 
	return ans;
}
 
int main(void)
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	cin >> n >> s;
 
	for (int i = 1; i <= n; i++)
	{
		for (int j = 1; j <= n; j++)
		{
			cin >> tab[i][j];
 
			if (tab[i][j] == 'M') ox = i, oy = j;
			if (tab[i][j] == 'D') dx = i, dy = j;
		}
	}
 
	memset(dist, -1, sizeof dist);
	bfs();
 
	cout << busca() << "\n";
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 3584 KB Output is correct
2 Correct 5 ms 3584 KB Output is correct
3 Correct 6 ms 3584 KB Output is correct
4 Correct 6 ms 3584 KB Output is correct
5 Correct 5 ms 3584 KB Output is correct
6 Correct 5 ms 3584 KB Output is correct
7 Correct 125 ms 4216 KB Output is correct
8 Correct 5 ms 3584 KB Output is correct
9 Correct 5 ms 3584 KB Output is correct
10 Correct 5 ms 3584 KB Output is correct
11 Correct 5 ms 3584 KB Output is correct
12 Correct 6 ms 3584 KB Output is correct
13 Correct 6 ms 3584 KB Output is correct
14 Correct 5 ms 3584 KB Output is correct
15 Correct 5 ms 3584 KB Output is correct
16 Correct 6 ms 3584 KB Output is correct
17 Correct 5 ms 3584 KB Output is correct
18 Correct 5 ms 3584 KB Output is correct
19 Correct 5 ms 3584 KB Output is correct
20 Correct 5 ms 3584 KB Output is correct
21 Correct 5 ms 3584 KB Output is correct
22 Correct 6 ms 3584 KB Output is correct
23 Correct 6 ms 3584 KB Output is correct
24 Correct 5 ms 3584 KB Output is correct
25 Correct 6 ms 3584 KB Output is correct
26 Correct 5 ms 3584 KB Output is correct
27 Correct 5 ms 3584 KB Output is correct
28 Correct 5 ms 3604 KB Output is correct
29 Correct 5 ms 3584 KB Output is correct
30 Correct 5 ms 3584 KB Output is correct
31 Correct 5 ms 3584 KB Output is correct
32 Correct 5 ms 3584 KB Output is correct
33 Correct 10 ms 3840 KB Output is correct
34 Correct 8 ms 3840 KB Output is correct
35 Correct 32 ms 3840 KB Output is correct
36 Correct 10 ms 3840 KB Output is correct
37 Correct 11 ms 3840 KB Output is correct
38 Correct 54 ms 3840 KB Output is correct
39 Correct 12 ms 3840 KB Output is correct
40 Correct 12 ms 3968 KB Output is correct
41 Correct 65 ms 3968 KB Output is correct
42 Correct 12 ms 3968 KB Output is correct
43 Correct 11 ms 3968 KB Output is correct
44 Correct 62 ms 3968 KB Output is correct
45 Correct 14 ms 3968 KB Output is correct
46 Correct 16 ms 3968 KB Output is correct
47 Correct 76 ms 3968 KB Output is correct
48 Correct 17 ms 3968 KB Output is correct
49 Correct 19 ms 4096 KB Output is correct
50 Correct 113 ms 4072 KB Output is correct
51 Correct 16 ms 4088 KB Output is correct
52 Correct 21 ms 4096 KB Output is correct
53 Correct 108 ms 4088 KB Output is correct
54 Correct 22 ms 4096 KB Output is correct
55 Correct 25 ms 4096 KB Output is correct
56 Correct 148 ms 4216 KB Output is correct
57 Correct 21 ms 4224 KB Output is correct
58 Correct 28 ms 4216 KB Output is correct
59 Correct 148 ms 4216 KB Output is correct
60 Correct 22 ms 4224 KB Output is correct
61 Correct 20 ms 4196 KB Output is correct
62 Correct 161 ms 4224 KB Output is correct
63 Correct 133 ms 4216 KB Output is correct
64 Correct 241 ms 4260 KB Output is correct
65 Correct 178 ms 4216 KB Output is correct
66 Correct 140 ms 4320 KB Output is correct
67 Correct 139 ms 4248 KB Output is correct
68 Correct 64 ms 4216 KB Output is correct
69 Correct 60 ms 4216 KB Output is correct
70 Correct 40 ms 4216 KB Output is correct
71 Correct 55 ms 4260 KB Output is correct
72 Correct 37 ms 4216 KB Output is correct
73 Correct 52 ms 4448 KB Output is correct
74 Correct 71 ms 4320 KB Output is correct
75 Correct 103 ms 4576 KB Output is correct
76 Correct 84 ms 4320 KB Output is correct
77 Correct 76 ms 4448 KB Output is correct
78 Correct 114 ms 4348 KB Output is correct
79 Correct 69 ms 4396 KB Output is correct
80 Correct 94 ms 4424 KB Output is correct
81 Correct 93 ms 4348 KB Output is correct
82 Correct 76 ms 4476 KB Output is correct
83 Correct 118 ms 4256 KB Output is correct
84 Correct 105 ms 4396 KB Output is correct
85 Correct 107 ms 4252 KB Output is correct
86 Correct 103 ms 4360 KB Output is correct
87 Correct 99 ms 4256 KB Output is correct
88 Correct 122 ms 4312 KB Output is correct
89 Correct 108 ms 4308 KB Output is correct
90 Correct 120 ms 4308 KB Output is correct
91 Correct 132 ms 4388 KB Output is correct
92 Correct 141 ms 4316 KB Output is correct