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Submission #309482

# Submission time Handle Problem Language Result Execution time Memory
309482 2020-10-03T15:30:13 Z Temmie Mecho (IOI09_mecho) C++17
100 / 100
 262 ms 6352 KB 
#include <bits/stdc++.h>

int n, s;
std::vector <std::string> g;
std::vector <std::vector <int>> bee;

bool ff(int val) {
	std::vector <std::vector <int>> bear(n, std::vector <int> (n, 1e9));
	int endX, endY;
	std::queue <std::pair <int, int>> q;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) {
			if (g[i][j] == 'D') endX = j, endY = i;
			if (g[i][j] == 'M') {
				bear[i][j] = 0;
				q.push({ j, i });
			}
		}
	}
	if (val >= bee[q.front().second][q.front().first]) return false;
	while (q.size()) {
		auto now = q.front(); q.pop();
		int x = now.first, y = now.second;
		if (x + 1 >= 0 && y >= 0 && x + 1 < n && y < n && g[y][x + 1] != 'T' && bear[y][x + 1] == int(1e9) && ((bear[y][x] + 1) / s) + val < bee[y][x + 1]) q.push({ x + 1, y }), bear[y][x + 1] = bear[y][x] + 1;
		if (x >= 0 && y + 1 >= 0 && x < n && y + 1 < n && g[y + 1][x] != 'T' && bear[y + 1][x] == int(1e9) && ((bear[y][x] + 1) / s) + val < bee[y + 1][x]) q.push({ x, y + 1 }), bear[y + 1][x] = bear[y][x] + 1;
		if (x - 1 >= 0 && y >= 0 && x - 1 < n && y < n && g[y][x - 1] != 'T' && bear[y][x - 1] == int(1e9) && ((bear[y][x] + 1) / s) + val < bee[y][x - 1]) q.push({ x - 1, y }), bear[y][x - 1] = bear[y][x] + 1;
		if (x >= 0 && y - 1 >= 0 && x < n && y - 1 < n && g[y - 1][x] != 'T' && bear[y - 1][x] == int(1e9) && ((bear[y][x] + 1) / s) + val < bee[y - 1][x]) q.push({ x, y - 1 }), bear[y - 1][x] = bear[y][x] + 1;
	}
	return bear[endY][endX] < int(1e9);
}

int main() {
	std::ios::sync_with_stdio(0); std::cin.tie(0);
	
	std::cin >> n >> s;
	g.resize(n);
	for (auto& x : g) std::cin >> x;
	bee.resize(n, std::vector <int> (n, 1e9));
	std::queue <std::pair <int, int>> q;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) {
			if (g[i][j] == 'H') {
				q.push({ j, i });
				bee[i][j] = 0;
			}
		}
	}
	while (q.size()) {
		auto now = q.front(); q.pop();
		int x = now.first, y = now.second;
		if (x + 1 >= 0 && y >= 0 && x + 1 < n && y < n && bee[y][x + 1] == int(1e9) && g[y][x + 1] != 'T' && g[y][x + 1] != 'D') q.push({ x + 1, y }), bee[y][x + 1] = bee[y][x] + 1;
		if (x >= 0 && y + 1 >= 0 && x < n && y + 1 < n && bee[y + 1][x] == int(1e9) && g[y + 1][x] != 'T' && g[y + 1][x] != 'D') q.push({ x, y + 1 }), bee[y + 1][x] = bee[y][x] + 1;
		if (x - 1 >= 0 && y >= 0 && x - 1 < n && y < n && bee[y][x - 1] == int(1e9) && g[y][x - 1] != 'T' && g[y][x - 1] != 'D') q.push({ x - 1, y }), bee[y][x - 1] = bee[y][x] + 1;
		if (x >= 0 && y - 1 >= 0 && x < n && y - 1 < n && bee[y - 1][x] == int(1e9) && g[y - 1][x] != 'T' && g[y - 1][x] != 'D') q.push({ x, y - 1 }), bee[y - 1][x] = bee[y][x] + 1;
	}
	int l = -1, r = n * n;
	while (l + 1 < r) {
		int mid = (l + r) >> 1;
		if (ff(mid)) l = mid;
		else r = mid;
	}
	std::cout << l << "\n";
	
}

Compilation message

mecho.cpp: In function 'bool ff(int)':
mecho.cpp:29:18: warning: 'endY' may be used uninitialized in this function [-Wmaybe-uninitialized]
   29 |  return bear[endY][endX] < int(1e9);
      |                  ^
mecho.cpp:29:24: warning: 'endX' may be used uninitialized in this function [-Wmaybe-uninitialized]
   29 |  return bear[endY][endX] < int(1e9);
      |                        ^

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 0 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 0 ms 384 KB Output is correct
7 Correct 133 ms 6180 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 0 ms 384 KB Output is correct
10 Correct 0 ms 384 KB Output is correct
11 Correct 0 ms 384 KB Output is correct
12 Correct 1 ms 384 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 1 ms 384 KB Output is correct
15 Correct 1 ms 384 KB Output is correct
16 Correct 0 ms 384 KB Output is correct
17 Correct 1 ms 384 KB Output is correct
18 Correct 0 ms 384 KB Output is correct
19 Correct 1 ms 384 KB Output is correct
20 Correct 0 ms 384 KB Output is correct
21 Correct 1 ms 384 KB Output is correct
22 Correct 1 ms 384 KB Output is correct
23 Correct 1 ms 384 KB Output is correct
24 Correct 1 ms 384 KB Output is correct
25 Correct 1 ms 384 KB Output is correct
26 Correct 1 ms 384 KB Output is correct
27 Correct 1 ms 384 KB Output is correct
28 Correct 1 ms 384 KB Output is correct
29 Correct 1 ms 384 KB Output is correct
30 Correct 1 ms 384 KB Output is correct
31 Correct 1 ms 384 KB Output is correct
32 Correct 1 ms 384 KB Output is correct
33 Correct 9 ms 1540 KB Output is correct
34 Correct 10 ms 1560 KB Output is correct
35 Correct 29 ms 1508 KB Output is correct
36 Correct 12 ms 1792 KB Output is correct
37 Correct 13 ms 1852 KB Output is correct
38 Correct 38 ms 1852 KB Output is correct
39 Correct 15 ms 2224 KB Output is correct
40 Correct 16 ms 2232 KB Output is correct
41 Correct 52 ms 2224 KB Output is correct
42 Correct 20 ms 2712 KB Output is correct
43 Correct 20 ms 2656 KB Output is correct
44 Correct 69 ms 2680 KB Output is correct
45 Correct 24 ms 3104 KB Output is correct
46 Correct 24 ms 3120 KB Output is correct
47 Correct 80 ms 3260 KB Output is correct
48 Correct 28 ms 3700 KB Output is correct
49 Correct 30 ms 3696 KB Output is correct
50 Correct 91 ms 3724 KB Output is correct
51 Correct 36 ms 4360 KB Output is correct
52 Correct 38 ms 4224 KB Output is correct
53 Correct 121 ms 4208 KB Output is correct
54 Correct 43 ms 4832 KB Output is correct
55 Correct 42 ms 4852 KB Output is correct
56 Correct 139 ms 4952 KB Output is correct
57 Correct 47 ms 5604 KB Output is correct
58 Correct 50 ms 5476 KB Output is correct
59 Correct 162 ms 5480 KB Output is correct
60 Correct 56 ms 6336 KB Output is correct
61 Correct 56 ms 6288 KB Output is correct
62 Correct 185 ms 6160 KB Output is correct
63 Correct 149 ms 6176 KB Output is correct
64 Correct 262 ms 6148 KB Output is correct
65 Correct 200 ms 6252 KB Output is correct
66 Correct 168 ms 6160 KB Output is correct
67 Correct 163 ms 6220 KB Output is correct
68 Correct 82 ms 6232 KB Output is correct
69 Correct 83 ms 6192 KB Output is correct
70 Correct 68 ms 6184 KB Output is correct
71 Correct 75 ms 6192 KB Output is correct
72 Correct 64 ms 6352 KB Output is correct
73 Correct 66 ms 6188 KB Output is correct
74 Correct 96 ms 6184 KB Output is correct
75 Correct 114 ms 6156 KB Output is correct
76 Correct 101 ms 6180 KB Output is correct
77 Correct 99 ms 6180 KB Output is correct
78 Correct 118 ms 6252 KB Output is correct
79 Correct 85 ms 6192 KB Output is correct
80 Correct 105 ms 6264 KB Output is correct
81 Correct 111 ms 6244 KB Output is correct
82 Correct 102 ms 6172 KB Output is correct
83 Correct 124 ms 6200 KB Output is correct
84 Correct 112 ms 6180 KB Output is correct
85 Correct 123 ms 6176 KB Output is correct
86 Correct 116 ms 6184 KB Output is correct
87 Correct 120 ms 6184 KB Output is correct
88 Correct 127 ms 6260 KB Output is correct
89 Correct 126 ms 6188 KB Output is correct
90 Correct 133 ms 6168 KB Output is correct
91 Correct 126 ms 6224 KB Output is correct
92 Correct 137 ms 6224 KB Output is correct