oj.uz

Submission #79405

# Submission time Handle Problem Language Result Execution time Memory
79405 2018-10-13T07:56:42 Z tmwilliamlin168 Mecho (IOI09_mecho) C++14
100 / 100
 290 ms 11352 KB 
#include <bits/stdc++.h>
using namespace std;

const int mxN=800;
int n, s, d1[mxN][mxN], d2[mxN][mxN], si, sj, ti, tj, lb=0, rb=mxN*mxN, nb[4][2]={{0, 1}, {1, 0}, {0, -1}, {-1, 0}};
string g[mxN];
array<int, 2> qu[mxN*mxN];

void bfs(int d[mxN][mxN], int a) {
	int qt=0;
	for(int i=0; i<n; ++i)
		for(int j=0; j<n; ++j)
			if(!d[i][j])
				qu[qt++]={i, j};
	for(int i=0; i<qt; ++i) {
		array<int, 2> u=qu[i];
//		if(a)
//			cout << u[0] << " " << u[1] << endl;
		if(a>=0&&d[u[0]][u[1]]/s+a>=d1[u[0]][u[1]])
			continue;
		for(int j=0; j<4; ++j) {
			int ni=u[0]+nb[j][0], nj=u[1]+nb[j][1];
			if(ni>=0&&ni<n&&nj>=0&&nj<n&&g[ni][nj]!='T'&&(a>=0||g[ni][nj]!='D')&&d[ni][nj]>1e7) {
				d[ni][nj]=d[u[0]][u[1]]+1;
				qu[qt++]={ni, nj};
			}
		}
	}
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	
	cin >> n >> s;
	for(int i=0; i<n; ++i)
		cin >> g[i];
	memset(d1, 1, sizeof(d1));
	for(int i=0; i<n; ++i) {
		for(int j=0; j<n; ++j) {
			if(g[i][j]=='M') {
				si=i;
				sj=j;
			} else if(g[i][j]=='D') {
				ti=i;
				tj=j;
			} else if(g[i][j]=='H')
				d1[i][j]=0;
		}
	}
	bfs(d1, -1);
	while(lb<=rb) {
		int mb=(lb+rb)/2;
//		cout << "bs " << mb << endl;
		memset(d2, 1, sizeof(d2));
		d2[si][sj]=0;
		bfs(d2, mb);
		if(d2[ti][tj]<1e7)
			lb=mb+1;
		else
			rb=mb-1;
	}
	cout << rb;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 5368 KB Output is correct
2 Correct 9 ms 5540 KB Output is correct
3 Correct 9 ms 5540 KB Output is correct
4 Correct 8 ms 5540 KB Output is correct
5 Correct 8 ms 5540 KB Output is correct
6 Correct 9 ms 5540 KB Output is correct
7 Correct 130 ms 11128 KB Output is correct
8 Correct 8 ms 11128 KB Output is correct
9 Correct 9 ms 11128 KB Output is correct
10 Correct 8 ms 11128 KB Output is correct
11 Correct 9 ms 11128 KB Output is correct
12 Correct 8 ms 11128 KB Output is correct
13 Correct 9 ms 11128 KB Output is correct
14 Correct 9 ms 11128 KB Output is correct
15 Correct 9 ms 11128 KB Output is correct
16 Correct 9 ms 11128 KB Output is correct
17 Correct 8 ms 11128 KB Output is correct
18 Correct 8 ms 11128 KB Output is correct
19 Correct 8 ms 11128 KB Output is correct
20 Correct 8 ms 11128 KB Output is correct
21 Correct 9 ms 11128 KB Output is correct
22 Correct 8 ms 11128 KB Output is correct
23 Correct 8 ms 11128 KB Output is correct
24 Correct 8 ms 11128 KB Output is correct
25 Correct 9 ms 11128 KB Output is correct
26 Correct 9 ms 11128 KB Output is correct
27 Correct 9 ms 11128 KB Output is correct
28 Correct 9 ms 11128 KB Output is correct
29 Correct 9 ms 11128 KB Output is correct
30 Correct 8 ms 11128 KB Output is correct
31 Correct 8 ms 11128 KB Output is correct
32 Correct 9 ms 11128 KB Output is correct
33 Correct 14 ms 11128 KB Output is correct
34 Correct 13 ms 11128 KB Output is correct
35 Correct 35 ms 11128 KB Output is correct
36 Correct 15 ms 11128 KB Output is correct
37 Correct 16 ms 11128 KB Output is correct
38 Correct 44 ms 11128 KB Output is correct
39 Correct 16 ms 11128 KB Output is correct
40 Correct 17 ms 11128 KB Output is correct
41 Correct 54 ms 11128 KB Output is correct
42 Correct 20 ms 11128 KB Output is correct
43 Correct 19 ms 11128 KB Output is correct
44 Correct 106 ms 11128 KB Output is correct
45 Correct 23 ms 11128 KB Output is correct
46 Correct 25 ms 11128 KB Output is correct
47 Correct 77 ms 11128 KB Output is correct
48 Correct 24 ms 11128 KB Output is correct
49 Correct 24 ms 11128 KB Output is correct
50 Correct 135 ms 11128 KB Output is correct
51 Correct 26 ms 11128 KB Output is correct
52 Correct 26 ms 11128 KB Output is correct
53 Correct 134 ms 11128 KB Output is correct
54 Correct 27 ms 11128 KB Output is correct
55 Correct 27 ms 11128 KB Output is correct
56 Correct 173 ms 11128 KB Output is correct
57 Correct 34 ms 11128 KB Output is correct
58 Correct 34 ms 11128 KB Output is correct
59 Correct 195 ms 11128 KB Output is correct
60 Correct 35 ms 11128 KB Output is correct
61 Correct 39 ms 11128 KB Output is correct
62 Correct 209 ms 11128 KB Output is correct
63 Correct 147 ms 11128 KB Output is correct
64 Correct 290 ms 11128 KB Output is correct
65 Correct 229 ms 11128 KB Output is correct
66 Correct 188 ms 11128 KB Output is correct
67 Correct 159 ms 11128 KB Output is correct
68 Correct 74 ms 11128 KB Output is correct
69 Correct 72 ms 11128 KB Output is correct
70 Correct 57 ms 11128 KB Output is correct
71 Correct 63 ms 11128 KB Output is correct
72 Correct 49 ms 11128 KB Output is correct
73 Correct 59 ms 11260 KB Output is correct
74 Correct 90 ms 11260 KB Output is correct
75 Correct 109 ms 11260 KB Output is correct
76 Correct 93 ms 11260 KB Output is correct
77 Correct 103 ms 11260 KB Output is correct
78 Correct 115 ms 11260 KB Output is correct
79 Correct 76 ms 11260 KB Output is correct
80 Correct 93 ms 11264 KB Output is correct
81 Correct 116 ms 11264 KB Output is correct
82 Correct 111 ms 11264 KB Output is correct
83 Correct 125 ms 11264 KB Output is correct
84 Correct 116 ms 11264 KB Output is correct
85 Correct 132 ms 11264 KB Output is correct
86 Correct 122 ms 11264 KB Output is correct
87 Correct 115 ms 11264 KB Output is correct
88 Correct 124 ms 11264 KB Output is correct
89 Correct 125 ms 11352 KB Output is correct
90 Correct 139 ms 11352 KB Output is correct
91 Correct 142 ms 11352 KB Output is correct
92 Correct 145 ms 11352 KB Output is correct