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Submission #684468

# Submission time Handle Problem Language Result Execution time Memory
684468 2023-01-21T10:23:56 Z dsyz Hotspot (NOI17_hotspot) C++17
100 / 100
 734 ms 1516 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = double;
#define MAXN (1000005)
int main(){
	ios_base::sync_with_stdio(false);cin.tie(0);
	ll N,M;
	cin>>N>>M;
	vector<ll> v[N];
	for(ll i = 0;i < M;i++){
		ll a,b;
		cin>>a>>b;
		v[a].push_back(b);
		v[b].push_back(a);
	}
	ll K;
	cin>>K;
	queue<ll> q;
	ld ans[N];
	memset(ans,0,sizeof(ans));
	pair<ll,ll> dist1[N];
	pair<ll,ll> dist2[N];
	for(ll person = 0;person < K;person++){
		ll A,B;
		cin>>A>>B;
		for(ll i = 0;i < N;i++) dist1[i] = {1e9 + 5,0};
		q.push(A);
		dist1[A] = {0,1};
		while(!q.empty()){
			ll x = q.front();
			q.pop();
			for(auto u : v[x]){
				if(dist1[x].first + 1 < dist1[u].first){
					q.push(u);
					dist1[u] = {dist1[x].first + 1,dist1[x].second};
				}else if(dist1[x].first + 1 == dist1[u].first){
					dist1[u].second += dist1[x].second;
				}
			}
		}
		
		for(ll i = 0;i < N;i++) dist2[i] = {1e9 + 5,0};
		q.push(B);
		dist2[B] = {0,1};
		while(!q.empty()){
			ll x = q.front();
			q.pop();
			for(auto u : v[x]){
				if(dist2[x].first + 1 < dist2[u].first){
					q.push(u);
					dist2[u] = {dist2[x].first + 1,dist2[x].second};
				}else if(dist2[x].first + 1 == dist2[u].first){
					dist2[u].second += dist2[x].second;
				}
			}
		}
		
		for(ll i = 0;i < N;i++){
			if(dist1[i].first + dist2[i].first == dist1[B].first){
				ans[i] += ld(dist1[i].second * dist2[i].second) / ld(dist1[B].second);
			}
		}
	}
	ld maximum = -1e18;
	ll index = 0;
	for(ll i = 0;i < N;i++){
		if(ans[i] > maximum){
			maximum = ans[i];
			index = i;
		}
	}
	cout<<index<<'\n';
}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 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 212 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 340 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 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 212 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 0 ms 340 KB Output is correct

Subtask #3
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 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 212 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 2 ms 340 KB Output is correct
10 Correct 2 ms 340 KB Output is correct
11 Correct 2 ms 340 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 212 KB Output is correct
14 Correct 2 ms 340 KB Output is correct

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 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 212 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 0 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 2 ms 340 KB Output is correct
17 Correct 2 ms 340 KB Output is correct
18 Correct 2 ms 340 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 2 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 2 ms 340 KB Output is correct
24 Correct 2 ms 340 KB Output is correct
25 Correct 4 ms 412 KB Output is correct
26 Correct 4 ms 468 KB Output is correct
27 Correct 1 ms 212 KB Output is correct
28 Correct 3 ms 340 KB Output is correct

Subtask #5
26.0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 1 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 212 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 0 ms 340 KB Output is correct
15 Correct 1 ms 468 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 4 ms 468 KB Output is correct
18 Correct 2 ms 340 KB Output is correct
19 Correct 4 ms 584 KB Output is correct
20 Correct 2 ms 468 KB Output is correct
21 Correct 1 ms 340 KB Output is correct

Subtask #6
36.0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 1 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 212 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 0 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 2 ms 340 KB Output is correct
17 Correct 2 ms 340 KB Output is correct
18 Correct 2 ms 340 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 2 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 2 ms 340 KB Output is correct
24 Correct 2 ms 340 KB Output is correct
25 Correct 4 ms 412 KB Output is correct
26 Correct 4 ms 468 KB Output is correct
27 Correct 1 ms 212 KB Output is correct
28 Correct 3 ms 340 KB Output is correct
29 Correct 1 ms 468 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 4 ms 468 KB Output is correct
32 Correct 2 ms 340 KB Output is correct
33 Correct 4 ms 584 KB Output is correct
34 Correct 2 ms 468 KB Output is correct
35 Correct 1 ms 340 KB Output is correct
36 Correct 54 ms 584 KB Output is correct
37 Correct 130 ms 808 KB Output is correct
38 Correct 734 ms 1484 KB Output is correct
39 Correct 469 ms 1492 KB Output is correct
40 Correct 72 ms 800 KB Output is correct
41 Correct 430 ms 1428 KB Output is correct
42 Correct 572 ms 1516 KB Output is correct
43 Correct 33 ms 596 KB Output is correct
44 Correct 28 ms 652 KB Output is correct