oj.uz

Submission #876669

# Submission time Handle Problem Language Result Execution time Memory
876669 2023-11-22T07:58:19 Z MisterReaper Mecho (IOI09_mecho) C++17
84 / 100
 125 ms 7780 KB 
#pragma optimize("unroll-loops,O3")

#include <bits/stdc++.h>
using namespace std;
using i64 = long long;

const int MAXN = 800 + 5;

char matrix[MAXN][MAXN];
int distBee[MAXN][MAXN];
int distBear[MAXN][MAXN];

int dx[4] = {0, 1, 0, -1};
int dy[4] = {1, 0, -1, 0};

#define ONLINE_JUDGE
void solve() {
	memset(distBee, -1, sizeof(distBee));

	int n, s;
	cin >> n >> s;

	pair <int, int> initial;
	pair <int, int> home;

	queue <array <int, 3>> q;
	for(int i = 1; i <= n; i++) {
		for(int j = 1; j <= n; j++) {
			cin >> matrix[i][j];
			if(matrix[i][j] == 'H') {
				q.push({0, i, j});
			} else if(matrix[i][j] == 'M') {
				initial = {i, j};
			} else if(matrix[i][j] == 'D') {
				home = {i, j};
			}
		}
	}

	auto in = [&](int x, int y) -> bool {
		return 1 <= min(x, y) && max(x, y) <= n;
	};

	while(!q.empty()) {
		auto [d, x, y] = q.front();
		q.pop();
		if(distBee[x][y] != -1) {
			continue;
		}

		distBee[x][y] = d;
		for(int dir = 0; dir < 4; dir++) {
			int _x = x + dx[dir], _y = y + dy[dir];
			if(in(_x, _y) && matrix[_x][_y] == 'G') {
				q.push({d +1, _x, _y});
			}
		}
	}

	auto check = [&](int k) -> bool {
		memset(distBear, -1, sizeof(distBear));

		q.push({s * k, initial.first, initial.second});
		while(!q.empty()) {
			auto [d, x, y] = q.front();
			q.pop();
			if(distBear[x][y] != -1 || (distBee[x][y] != -1 && d / s >= distBee[x][y])) {
				continue;
			}

			//cerr << d << " :: " << x << " " << y << " | " << distBee[x][y] << "\n";
			distBear[x][y] = d;
			for(int dir = 0; dir < 4; dir++) {
				int _x = x + dx[dir], _y = y + dy[dir];
				if(in(_x, _y) && (matrix[_x][_y] == 'G' || matrix[_x][_y] == 'D') && distBear[_x][_y] == -1) {
					q.push({d +1, _x, _y});
				}
			}
		}

		if(distBear[home.first][home.second] == -1) {
			return false;
		}

		return true;
	};
	
	int l = 0, r = n * n + 2, ans = 0;
	while(l <= r) {
		int mid = (l + r) / 2;
		if(check(mid -1)) {
			ans = mid;
			l = mid +1;
		} else {
			r = mid -1;
		}
	}

	cout << ans -1;

	return;
}

signed main() {
	#ifndef ONLINE_JUDGE
		freopen(".in", "r", stdin);
		freopen(".out", "w", stdout);
	#endif

	ios_base::sync_with_stdio(false);
	cin.tie(NULL); cout.tie(NULL);

	int t = 1; //cin >> t;
	for(int i = 1; i <= t; i++) {
		solve();
	}

	return 0;
}

Compilation message

mecho.cpp:1: warning: ignoring '#pragma optimize ' [-Wunknown-pragmas]
    1 | #pragma optimize("unroll-loops,O3")
      |

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 5468 KB Output is correct
2 Correct 1 ms 5532 KB Output is correct
3 Correct 1 ms 5468 KB Output is correct
4 Correct 1 ms 5468 KB Output is correct
5 Correct 2 ms 5468 KB Output is correct
6 Correct 2 ms 5468 KB Output is correct
7 Correct 109 ms 6800 KB Output is correct
8 Correct 2 ms 5464 KB Output is correct
9 Correct 1 ms 5468 KB Output is correct
10 Correct 2 ms 5468 KB Output is correct
11 Correct 2 ms 5468 KB Output is correct
12 Incorrect 2 ms 5468 KB Output isn't correct
13 Incorrect 2 ms 5468 KB Output isn't correct
14 Correct 2 ms 5468 KB Output is correct
15 Correct 1 ms 5468 KB Output is correct
16 Correct 1 ms 5468 KB Output is correct
17 Correct 1 ms 5468 KB Output is correct
18 Correct 2 ms 5468 KB Output is correct
19 Correct 2 ms 5468 KB Output is correct
20 Correct 2 ms 5468 KB Output is correct
21 Correct 1 ms 5468 KB Output is correct
22 Correct 2 ms 5532 KB Output is correct
23 Correct 2 ms 5468 KB Output is correct
24 Correct 2 ms 5468 KB Output is correct
25 Correct 2 ms 5468 KB Output is correct
26 Correct 2 ms 5468 KB Output is correct
27 Correct 2 ms 5468 KB Output is correct
28 Correct 2 ms 5468 KB Output is correct
29 Correct 2 ms 5536 KB Output is correct
30 Correct 2 ms 5468 KB Output is correct
31 Correct 2 ms 5468 KB Output is correct
32 Correct 2 ms 5468 KB Output is correct
33 Correct 7 ms 5720 KB Output is correct
34 Correct 5 ms 5724 KB Output is correct
35 Correct 21 ms 5724 KB Output is correct
36 Correct 6 ms 5664 KB Output is correct
37 Correct 7 ms 5724 KB Output is correct
38 Correct 27 ms 5724 KB Output is correct
39 Correct 7 ms 5720 KB Output is correct
40 Correct 8 ms 5724 KB Output is correct
41 Correct 33 ms 5720 KB Output is correct
42 Correct 8 ms 5724 KB Output is correct
43 Correct 9 ms 5724 KB Output is correct
44 Correct 50 ms 5928 KB Output is correct
45 Correct 9 ms 5724 KB Output is correct
46 Correct 10 ms 5724 KB Output is correct
47 Correct 49 ms 5812 KB Output is correct
48 Correct 11 ms 5832 KB Output is correct
49 Correct 12 ms 6008 KB Output is correct
50 Correct 62 ms 5852 KB Output is correct
51 Correct 12 ms 5976 KB Output is correct
52 Correct 17 ms 5980 KB Output is correct
53 Correct 68 ms 5980 KB Output is correct
54 Correct 15 ms 5976 KB Output is correct
55 Correct 15 ms 5904 KB Output is correct
56 Correct 86 ms 5980 KB Output is correct
57 Correct 15 ms 5980 KB Output is correct
58 Correct 18 ms 5940 KB Output is correct
59 Correct 100 ms 6236 KB Output is correct
60 Correct 18 ms 5976 KB Output is correct
61 Correct 20 ms 5976 KB Output is correct
62 Correct 109 ms 6180 KB Output is correct
63 Correct 88 ms 5968 KB Output is correct
64 Correct 122 ms 6228 KB Output is correct
65 Correct 125 ms 6152 KB Output is correct
66 Correct 111 ms 5968 KB Output is correct
67 Correct 91 ms 5968 KB Output is correct
68 Correct 42 ms 6236 KB Output is correct
69 Correct 43 ms 6236 KB Output is correct
70 Correct 35 ms 6080 KB Output is correct
71 Correct 32 ms 6232 KB Output is correct
72 Incorrect 31 ms 6064 KB Output isn't correct
73 Incorrect 98 ms 7780 KB Output isn't correct
74 Correct 60 ms 7596 KB Output is correct
75 Correct 98 ms 7772 KB Output is correct
76 Correct 68 ms 7736 KB Output is correct
77 Correct 70 ms 7712 KB Output is correct
78 Correct 81 ms 7620 KB Output is correct
79 Correct 56 ms 7616 KB Output is correct
80 Correct 65 ms 7508 KB Output is correct
81 Correct 80 ms 7516 KB Output is correct
82 Correct 67 ms 7616 KB Output is correct
83 Correct 77 ms 7168 KB Output is correct
84 Correct 73 ms 7192 KB Output is correct
85 Correct 70 ms 7252 KB Output is correct
86 Correct 79 ms 7364 KB Output is correct
87 Correct 79 ms 7252 KB Output is correct
88 Correct 78 ms 6968 KB Output is correct
89 Correct 79 ms 6936 KB Output is correct
90 Correct 86 ms 6996 KB Output is correct
91 Correct 112 ms 7008 KB Output is correct
92 Correct 90 ms 6992 KB Output is correct