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답안 #1037098

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1037098 2024-07-28T04:17:20 Z sssamui Mecho (IOI09_mecho) C++17
100 / 100
 142 ms 4184 KB 
#include <iostream>
#include <cstdio>
#include <vector>
#include <cmath>
#include <queue>
using namespace std;

vector<vector<char>> grd(802, vector<char>(802, 'T'));
vector<vector<bool>> swm(802, vector<bool>(802, false));
vector<vector<int>> btime(802, vector<int>(802, 1e8));
int sttr, sttc;
int dstr, dstc;
int h, s;

vector<int> radd = { -1, 0, 1, 0 };
vector<int> cadd = { 0, -1, 0, 1 };

bool check(int tchk)
{
	queue<pair<int, pair<int, int>>> bfs;
	bfs.push({ 0, {sttr, sttc} });
	vector<vector<bool>> poss(h + 2, vector<bool>(h + 2, false));
	poss[sttr][sttc] = true;
	while (!bfs.empty() && !poss[dstr][dstc])
	{
		int r = bfs.front().second.first, c = bfs.front().second.second, dst = bfs.front().first;
		bfs.pop();
		for (int dir = 0; dir < 4; dir++) if (!poss[r + radd[dir]][c + cadd[dir]]) if (grd[r + radd[dir]][c + cadd[dir]] == 'G')
			if ((dst + 1) / s < btime[r + radd[dir]][c + cadd[dir]] - tchk)
			{
				poss[r + radd[dir]][c + cadd[dir]] = true;
				bfs.push({ dst + 1, {r + radd[dir], c + cadd[dir]} });
			}
	}

	return poss[dstr][dstc];
}

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	cin >> h >> s;
	queue<pair<int, int>> swmpcs;
	for (int i = 1; i <= h; i++) for (int j = 1; j <= h; j++)
	{
		cin >> grd[i][j];
		if (grd[i][j] == 'M')
		{
			sttr = i;
			sttc = j;
			grd[i][j] = 'G';
		}

		else if (grd[i][j] == 'D')
		{
			dstr = i;
			dstc = j;
			grd[i][j] = 'T';
		}

		else if (grd[i][j] == 'H')
		{
			swmpcs.push({ i, j });
			btime[i][j] = 0;
			swm[i][j] = true;
			grd[i][j] = 'T';
		}
	}

	while (!swmpcs.empty())
	{
		int r = swmpcs.front().first, c = swmpcs.front().second;
		swmpcs.pop();
		for (int dir = 0; dir < 4; dir++) if ((!swm[r + radd[dir]][c + cadd[dir]]) && (grd[r + radd[dir]][c + cadd[dir]] == 'G'))
		{
			swm[r + radd[dir]][c + cadd[dir]] = true;
			btime[r + radd[dir]][c + cadd[dir]] = btime[r][c] + 1;
			swmpcs.push({ r + radd[dir], c + cadd[dir] });
		}
	}


	btime[dstr][dstc] = 1e8;
	grd[dstr][dstc] = 'G';

	if (!check(0)) cout << -1;
	else
	{
		int l = 0, r = btime[sttr][sttc] - 1;
		while (l < r)
		{
			int mid = l + (r - l + 1) / 2;
			if (check(mid)) l = mid;
			else r = mid - 1;
		}

		cout << l;
	}
}

Subtask #1
100.0 / 100.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 3676 KB Output is correct
2 Correct 2 ms 3676 KB Output is correct
3 Correct 2 ms 3676 KB Output is correct
4 Correct 2 ms 3740 KB Output is correct
5 Correct 2 ms 3676 KB Output is correct
6 Correct 2 ms 3676 KB Output is correct
7 Correct 58 ms 3852 KB Output is correct
8 Correct 2 ms 3676 KB Output is correct
9 Correct 2 ms 3676 KB Output is correct
10 Correct 2 ms 3780 KB Output is correct
11 Correct 2 ms 3676 KB Output is correct
12 Correct 2 ms 3676 KB Output is correct
13 Correct 3 ms 3676 KB Output is correct
14 Correct 3 ms 3676 KB Output is correct
15 Correct 2 ms 3676 KB Output is correct
16 Correct 2 ms 3676 KB Output is correct
17 Correct 2 ms 3676 KB Output is correct
18 Correct 2 ms 3676 KB Output is correct
19 Correct 2 ms 3676 KB Output is correct
20 Correct 2 ms 3672 KB Output is correct
21 Correct 2 ms 3676 KB Output is correct
22 Correct 2 ms 3676 KB Output is correct
23 Correct 2 ms 3676 KB Output is correct
24 Correct 3 ms 3780 KB Output is correct
25 Correct 2 ms 3780 KB Output is correct
26 Correct 3 ms 3676 KB Output is correct
27 Correct 3 ms 3712 KB Output is correct
28 Correct 2 ms 3676 KB Output is correct
29 Correct 2 ms 3676 KB Output is correct
30 Correct 3 ms 3676 KB Output is correct
31 Correct 2 ms 3676 KB Output is correct
32 Correct 2 ms 3676 KB Output is correct
33 Correct 5 ms 3676 KB Output is correct
34 Correct 5 ms 3716 KB Output is correct
35 Correct 16 ms 3672 KB Output is correct
36 Correct 6 ms 3676 KB Output is correct
37 Correct 7 ms 3596 KB Output is correct
38 Correct 20 ms 3828 KB Output is correct
39 Correct 6 ms 3676 KB Output is correct
40 Correct 6 ms 3676 KB Output is correct
41 Correct 25 ms 3676 KB Output is correct
42 Correct 8 ms 3672 KB Output is correct
43 Correct 8 ms 3788 KB Output is correct
44 Correct 30 ms 3676 KB Output is correct
45 Correct 9 ms 3676 KB Output is correct
46 Correct 9 ms 3676 KB Output is correct
47 Correct 37 ms 3788 KB Output is correct
48 Correct 9 ms 3672 KB Output is correct
49 Correct 9 ms 3780 KB Output is correct
50 Correct 44 ms 3840 KB Output is correct
51 Correct 10 ms 3676 KB Output is correct
52 Correct 10 ms 3676 KB Output is correct
53 Correct 53 ms 3672 KB Output is correct
54 Correct 12 ms 3676 KB Output is correct
55 Correct 13 ms 3876 KB Output is correct
56 Correct 62 ms 3868 KB Output is correct
57 Correct 13 ms 3676 KB Output is correct
58 Correct 18 ms 3776 KB Output is correct
59 Correct 71 ms 3876 KB Output is correct
60 Correct 14 ms 3676 KB Output is correct
61 Correct 15 ms 3676 KB Output is correct
62 Correct 79 ms 3676 KB Output is correct
63 Correct 82 ms 3676 KB Output is correct
64 Correct 142 ms 3880 KB Output is correct
65 Correct 132 ms 3880 KB Output is correct
66 Correct 120 ms 3676 KB Output is correct
67 Correct 32 ms 3676 KB Output is correct
68 Correct 42 ms 3800 KB Output is correct
69 Correct 35 ms 3676 KB Output is correct
70 Correct 35 ms 3816 KB Output is correct
71 Correct 35 ms 3672 KB Output is correct
72 Correct 27 ms 3808 KB Output is correct
73 Correct 31 ms 4184 KB Output is correct
74 Correct 54 ms 3928 KB Output is correct
75 Correct 48 ms 3932 KB Output is correct
76 Correct 46 ms 3932 KB Output is correct
77 Correct 50 ms 3932 KB Output is correct
78 Correct 23 ms 3932 KB Output is correct
79 Correct 45 ms 3928 KB Output is correct
80 Correct 46 ms 3932 KB Output is correct
81 Correct 50 ms 3928 KB Output is correct
82 Correct 45 ms 3928 KB Output is correct
83 Correct 52 ms 4000 KB Output is correct
84 Correct 54 ms 3932 KB Output is correct
85 Correct 51 ms 3932 KB Output is correct
86 Correct 55 ms 3928 KB Output is correct
87 Correct 52 ms 3932 KB Output is correct
88 Correct 55 ms 3928 KB Output is correct
89 Correct 60 ms 3928 KB Output is correct
90 Correct 61 ms 3932 KB Output is correct
91 Correct 61 ms 3928 KB Output is correct
92 Correct 58 ms 3928 KB Output is correct