oj.uz

Submission #701538

# Submission time Handle Problem Language Result Execution time Memory
701538 2023-02-21T12:39:16 Z starplat Mecho (IOI09_mecho) C++14
100 / 100
 266 ms 8140 KB 
#include <bits/stdc++.h>
#define f first
#define s second
#define mp make_pair
using namespace std;
int n,S,vis[805][805],tim[805][805];
pair<int,int> st,ed,bck[805][805];
char c[805][805];
vector<pair<int,int>> d,path;
queue<pair<pair<int,int>,pair<int,int>>> q;
bool ok(int x,int y){
	return (1<=x && x<=n && 1<=y && y<=n);
}
bool pass(int T){
	T*=S;
	for (int i=1;i<=n;i++) for (int j=1;j<=n;j++) vis[i][j]=0;
	queue<pair<pair<int,int>,int>> t; t.push(mp(st,T));
	while (!t.empty()){
		auto x=t.front(); t.pop();
		if (x.f==ed) vis[x.f.f][x.f.s]=x.s;
		else if (x.s>=(tim[x.f.f][x.f.s]-1)*S || vis[x.f.f][x.f.s]) continue;
		vis[x.f.f][x.f.s]=x.s;
		for (auto k:d){
			int a=x.f.f+k.f; int b=x.f.s+k.s;
			if (ok(a,b) && c[a][b]!='T') t.push(mp(mp(a,b),x.s+1));
		}
	}
	return vis[ed.f][ed.s];
}
int main() {
	cin>>n>>S;
	d.push_back({1,0}); d.push_back({-1,0});
	d.push_back({0,-1}); d.push_back({0,1});
	for (int i=1;i<=n;i++){
		for (int j=1;j<=n;j++){
			cin>>c[i][j];
			if (c[i][j]=='D') ed=mp(i,j);
			if (c[i][j]=='M') st=mp(i,j);
		}
	}
	for (int i=1;i<=n;i++){
		for (int j=1;j<=n;j++){
			if (c[i][j]=='H') q.push(mp(mp(i,j),mp(0,0)));
		}
	}
	while (!q.empty()){
		auto x=q.front(); q.pop();
		if (tim[x.f.f][x.f.s]) continue;
		tim[x.f.f][x.f.s]=tim[x.s.f][x.s.s]+1;
		for (auto k:d){
			int a=x.f.f+k.f; int b=x.f.s+k.s;
			if (ok(a,b) && c[a][b]!='T' && c[a][b]!='D') q.push(mp(mp(a,b),x.f));
		}
	}
	if (pass(0)){
		int ans=0;
		int l=0; int r=n*n+5;
		while (l<=r){
			int mid=(l+r)/2;
			if (pass(mid)){
				ans=mid; l=mid+1;
			}
			else r=mid-1;
		}
		cout<<ans<<"\n";
	}
	else cout<<"-1\n";
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 190 ms 6752 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Correct 1 ms 724 KB Output is correct
13 Correct 1 ms 596 KB Output is correct
14 Correct 1 ms 724 KB Output is correct
15 Correct 0 ms 468 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 1 ms 468 KB Output is correct
19 Correct 0 ms 468 KB Output is correct
20 Correct 1 ms 468 KB Output is correct
21 Correct 1 ms 596 KB Output is correct
22 Correct 1 ms 596 KB Output is correct
23 Correct 1 ms 596 KB Output is correct
24 Correct 1 ms 596 KB Output is correct
25 Correct 1 ms 724 KB Output is correct
26 Correct 1 ms 724 KB Output is correct
27 Correct 1 ms 724 KB Output is correct
28 Correct 1 ms 724 KB Output is correct
29 Correct 1 ms 724 KB Output is correct
30 Correct 1 ms 724 KB Output is correct
31 Correct 1 ms 860 KB Output is correct
32 Correct 1 ms 852 KB Output is correct
33 Correct 12 ms 2772 KB Output is correct
34 Correct 13 ms 2772 KB Output is correct
35 Correct 43 ms 2748 KB Output is correct
36 Correct 15 ms 3156 KB Output is correct
37 Correct 16 ms 3168 KB Output is correct
38 Correct 56 ms 3076 KB Output is correct
39 Correct 18 ms 3412 KB Output is correct
40 Correct 20 ms 3504 KB Output is correct
41 Correct 77 ms 3480 KB Output is correct
42 Correct 23 ms 3856 KB Output is correct
43 Correct 25 ms 3828 KB Output is correct
44 Correct 98 ms 3880 KB Output is correct
45 Correct 27 ms 4180 KB Output is correct
46 Correct 33 ms 4280 KB Output is correct
47 Correct 105 ms 4196 KB Output is correct
48 Correct 32 ms 4464 KB Output is correct
49 Correct 35 ms 4556 KB Output is correct
50 Correct 129 ms 4604 KB Output is correct
51 Correct 37 ms 4852 KB Output is correct
52 Correct 41 ms 4820 KB Output is correct
53 Correct 161 ms 4956 KB Output is correct
54 Correct 43 ms 5196 KB Output is correct
55 Correct 46 ms 5176 KB Output is correct
56 Correct 181 ms 5344 KB Output is correct
57 Correct 49 ms 5616 KB Output is correct
58 Correct 54 ms 5620 KB Output is correct
59 Correct 221 ms 5668 KB Output is correct
60 Correct 55 ms 5960 KB Output is correct
61 Correct 61 ms 5964 KB Output is correct
62 Correct 235 ms 6032 KB Output is correct
63 Correct 162 ms 5992 KB Output is correct
64 Correct 266 ms 5988 KB Output is correct
65 Correct 209 ms 5964 KB Output is correct
66 Correct 175 ms 5892 KB Output is correct
67 Correct 64 ms 5964 KB Output is correct
68 Correct 87 ms 6100 KB Output is correct
69 Correct 82 ms 6004 KB Output is correct
70 Correct 68 ms 6020 KB Output is correct
71 Correct 74 ms 6008 KB Output is correct
72 Correct 67 ms 6172 KB Output is correct
73 Correct 91 ms 8140 KB Output is correct
74 Correct 154 ms 8060 KB Output is correct
75 Correct 157 ms 8132 KB Output is correct
76 Correct 145 ms 7900 KB Output is correct
77 Correct 141 ms 7900 KB Output is correct
78 Correct 78 ms 7884 KB Output is correct
79 Correct 140 ms 7884 KB Output is correct
80 Correct 140 ms 7960 KB Output is correct
81 Correct 159 ms 8016 KB Output is correct
82 Correct 154 ms 7872 KB Output is correct
83 Correct 173 ms 7632 KB Output is correct
84 Correct 180 ms 7640 KB Output is correct
85 Correct 173 ms 7640 KB Output is correct
86 Correct 165 ms 7516 KB Output is correct
87 Correct 167 ms 7576 KB Output is correct
88 Correct 182 ms 7184 KB Output is correct
89 Correct 193 ms 7244 KB Output is correct
90 Correct 188 ms 6952 KB Output is correct
91 Correct 187 ms 7264 KB Output is correct
92 Correct 193 ms 7300 KB Output is correct