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Submission #293936

# Submission time Handle Problem Language Result Execution time Memory
293936 2020-09-08T13:51:00 Z kshitij_sodani Mecho (IOI09_mecho) C++14
100 / 100
 276 ms 8448 KB 
#include <bits/stdc++.h>
using namespace std;
#define a first
#define b second
#define pb push_back

typedef long long llo;
#define endl '\n'



int n,s;
queue<pair<int,int>> ss;
int dist[801][801];
int it[801][801];
vector<int> x={1,-1,0,0};
vector<int> y={0,0,1,-1};
int dd[801][801];

pair<int,int> aa;
pair<int,int> bb;

bool check(int mid){
	queue<pair<int,int>> tt;
	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++){
			dd[i][j]=-1;
		}
	}
	dd[aa.a][aa.b]=0;
	tt.push({aa.a,aa.b});
	while(tt.size()){
		pair<int,int> no=tt.front();
		tt.pop();
		//if(dd[no.a][no.b])
		for(int i=0;i<4;i++){
			int xx=no.a+x[i];
			int yy=no.b+y[i];
			if(xx<0 or xx>=n or yy<0 or yy>=n){
				continue;
			}
			if(it[xx][yy]==0){
				continue;
			}
			if(dd[xx][yy]==-1){
				if(dist[xx][yy]!=-1){
					if(dist[xx][yy]<=mid+(dd[no.a][no.b]+1)/s){
					
						continue;
					}
				}

				dd[xx][yy]=dd[no.a][no.b]+1;
				//cout<<xx<<":"<<yy<<":"<<dd[xx][yy]<<endl;
				tt.push({xx,yy});
			}
		}
	}
	/*for(int i=0;i<n;i++){
		for(int j=0;j<n;j++){
			cout<<dd[i][j]<<",";
		}
		cout<<endl;
	}
	cout<<mid<<":"<<dd[bb.a][bb.b]<<endl;*/
	return dd[bb.a][bb.b]!=-1;

}
int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cin>>n>>s;
	
	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++){
			dist[i][j]=-1;
			char s;
			cin>>s;
			it[i][j]=1;
			if(s=='T'){
				it[i][j]=0;
			}
			else if(s=='G'){
			}
			else if(s=='M'){
				aa={i,j};
			}
			else if(s=='D'){
				it[i][j]=0;
				bb={i,j};
			}
			else if(s=='H'){
				ss.push({i,j});
				dist[i][j]=0;
			}
		}
	}
	while(ss.size()){
		pair<int,int> no=ss.front();
		ss.pop();
		for(int i=0;i<4;i++){
			int xx=no.a+x[i];
			int yy=no.b+y[i];
			if(xx<0 or xx>=n or yy<0 or yy>=n){
				continue;
			}
			if(it[xx][yy]==0){
				continue;
			}
			if(dist[xx][yy]==-1){
				dist[xx][yy]=dist[no.a][no.b]+1;
				ss.push({xx,yy});
			}
		}
	}
	int low=0;
	int high=dist[aa.a][aa.b]-1;
	it[bb.a][bb.b]=1;
	if(check(low)==false){
		cout<<-1<<endl;
	}
	else{
		while(low<high-1){
			int mid=(low+high)/2;
			if(check(mid)){
				low=mid;
			}
			else{
				high=mid;
			}
		}
		int ans=low;
		if(check(high)){
			ans=max(ans,high);
		}
		cout<<ans<<endl;
	}




	return 0;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 145 ms 8128 KB Output is correct
8 Correct 1 ms 512 KB Output is correct
9 Correct 1 ms 512 KB Output is correct
10 Correct 1 ms 512 KB Output is correct
11 Correct 1 ms 512 KB Output is correct
12 Correct 1 ms 896 KB Output is correct
13 Correct 1 ms 784 KB Output is correct
14 Correct 1 ms 896 KB Output is correct
15 Correct 1 ms 512 KB Output is correct
16 Correct 1 ms 512 KB Output is correct
17 Correct 1 ms 640 KB Output is correct
18 Correct 1 ms 512 KB Output is correct
19 Correct 1 ms 640 KB Output is correct
20 Correct 1 ms 640 KB Output is correct
21 Correct 1 ms 768 KB Output is correct
22 Correct 1 ms 768 KB Output is correct
23 Correct 1 ms 768 KB Output is correct
24 Correct 1 ms 768 KB Output is correct
25 Correct 2 ms 896 KB Output is correct
26 Correct 1 ms 896 KB Output is correct
27 Correct 2 ms 896 KB Output is correct
28 Correct 1 ms 1024 KB Output is correct
29 Correct 1 ms 1024 KB Output is correct
30 Correct 2 ms 1024 KB Output is correct
31 Correct 1 ms 1024 KB Output is correct
32 Correct 2 ms 1024 KB Output is correct
33 Correct 9 ms 3712 KB Output is correct
34 Correct 11 ms 3712 KB Output is correct
35 Correct 47 ms 3712 KB Output is correct
36 Correct 12 ms 4224 KB Output is correct
37 Correct 18 ms 4224 KB Output is correct
38 Correct 55 ms 4224 KB Output is correct
39 Correct 17 ms 4736 KB Output is correct
40 Correct 20 ms 4736 KB Output is correct
41 Correct 60 ms 4736 KB Output is correct
42 Correct 18 ms 5120 KB Output is correct
43 Correct 23 ms 5120 KB Output is correct
44 Correct 79 ms 5120 KB Output is correct
45 Correct 21 ms 5632 KB Output is correct
46 Correct 27 ms 5632 KB Output is correct
47 Correct 86 ms 5632 KB Output is correct
48 Correct 29 ms 6144 KB Output is correct
49 Correct 28 ms 6144 KB Output is correct
50 Correct 126 ms 6140 KB Output is correct
51 Correct 30 ms 6528 KB Output is correct
52 Correct 36 ms 6528 KB Output is correct
53 Correct 153 ms 6648 KB Output is correct
54 Correct 33 ms 7040 KB Output is correct
55 Correct 38 ms 7032 KB Output is correct
56 Correct 170 ms 7032 KB Output is correct
57 Correct 40 ms 7552 KB Output is correct
58 Correct 66 ms 7544 KB Output is correct
59 Correct 199 ms 7544 KB Output is correct
60 Correct 41 ms 7964 KB Output is correct
61 Correct 58 ms 7968 KB Output is correct
62 Correct 208 ms 8056 KB Output is correct
63 Correct 163 ms 7928 KB Output is correct
64 Correct 276 ms 8056 KB Output is correct
65 Correct 258 ms 8056 KB Output is correct
66 Correct 195 ms 8056 KB Output is correct
67 Correct 54 ms 8184 KB Output is correct
68 Correct 92 ms 8184 KB Output is correct
69 Correct 64 ms 8184 KB Output is correct
70 Correct 63 ms 8192 KB Output is correct
71 Correct 65 ms 8184 KB Output is correct
72 Correct 61 ms 8184 KB Output is correct
73 Correct 63 ms 8440 KB Output is correct
74 Correct 131 ms 8448 KB Output is correct
75 Correct 104 ms 8440 KB Output is correct
76 Correct 118 ms 8312 KB Output is correct
77 Correct 111 ms 8312 KB Output is correct
78 Correct 45 ms 8188 KB Output is correct
79 Correct 112 ms 8184 KB Output is correct
80 Correct 105 ms 8184 KB Output is correct
81 Correct 112 ms 8184 KB Output is correct
82 Correct 99 ms 8184 KB Output is correct
83 Correct 118 ms 8184 KB Output is correct
84 Correct 125 ms 8184 KB Output is correct
85 Correct 139 ms 8184 KB Output is correct
86 Correct 140 ms 8184 KB Output is correct
87 Correct 124 ms 8180 KB Output is correct
88 Correct 195 ms 8184 KB Output is correct
89 Correct 142 ms 8184 KB Output is correct
90 Correct 138 ms 8184 KB Output is correct
91 Correct 148 ms 8184 KB Output is correct
92 Correct 146 ms 8184 KB Output is correct