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Submission #949938

# Submission time Handle Problem Language Result Execution time Memory
949938 2024-03-19T23:34:44 Z Saul0906 Hotspot (NOI17_hotspot) C++14
38 / 100
 370 ms 16728 KB 
#include <bits/stdc++.h>
#define rep(a,b,c) for(int a=b; a<c; a++)
#define repa(a,b) for(auto a: b)
#define pb push_back
#define ll long long

using namespace std;

const int lim=5e5+5;
vector<int> ady[lim];
int cont[lim]{}, par[lim]{}, lvl[lim]{};
bool vis[lim]{};

void solve(int u, int v){
	if(lvl[u]<lvl[v]) swap(u,v);
	while(lvl[u]>lvl[v]){
		cont[u]++;
		u=par[u];
	}
	while(u!=v){
		cont[u]++;
		cont[v]++;
		u=par[u];
		v=par[v];
	}
	cont[u]++;
}

void dfs(int u, int p){
	vis[u]=true;
	par[u]=p;
	if(p!=-1) lvl[u]=lvl[p]+1;
	repa(v,ady[u]) if(!vis[v]) dfs(v,u);
}

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	int n, m, k, u, v;
	cin>>n>>m;
	rep(i,0,m){
		cin>>u>>v;
		ady[u].pb(v);
		ady[v].pb(u);
	}
	dfs(0,-1);
	cin>>k;
	rep(i,0,k){
		cin>>u>>v;
		if(k>20)solve(u,v);
		else{
			ll dis[n], dis2[n];
			bool vis[n]{}, vis2[n]{};
			queue<int> q;
			q.push(u);
			q.push(0);
			vis[u]=true;
			while(q.size()){
				int x=q.front(), w;
				q.pop();
				w=q.front();
				q.pop();
				dis[x]=w;
				repa(y,ady[x]){
					if(!vis[y]){
						vis[y]=true;
						q.push(y);
						q.push(w+1);
					}
				}
			}
			rep(j,0,n){
				fill(vis2,vis2+n,0);
				q.push(j);
				q.push(0);
				vis2[j]=true;
				while(q.size()){
					int x=q.front(), w;
					q.pop();
					w=q.front();
					q.pop();
					dis2[x]=w;
					repa(y,ady[x]){
						if(!vis2[y]){
							vis2[y]=true;
							q.push(y);
							q.push(w+1);
						}
					}
				}
				if(dis[v]==dis2[v]+dis[j] && dis[j]<=dis[v]) cont[j]++;
			}
		}
	}
	u=0;
	rep(i,0,lim) if(cont[u]<cont[i]) u=i;
	cout<<u<<endl;
}

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 16220 KB Output is correct
2 Correct 11 ms 16216 KB Output is correct
3 Correct 9 ms 16220 KB Output is correct
4 Correct 5 ms 16220 KB Output is correct
5 Correct 6 ms 16356 KB Output is correct
6 Correct 5 ms 16356 KB Output is correct
7 Correct 7 ms 16220 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 16220 KB Output is correct
2 Correct 11 ms 16216 KB Output is correct
3 Correct 9 ms 16220 KB Output is correct
4 Correct 5 ms 16220 KB Output is correct
5 Correct 6 ms 16356 KB Output is correct
6 Correct 5 ms 16356 KB Output is correct
7 Correct 7 ms 16220 KB Output is correct
8 Correct 6 ms 16220 KB Output is correct
9 Correct 8 ms 16368 KB Output is correct
10 Correct 12 ms 16216 KB Output is correct
11 Correct 5 ms 16220 KB Output is correct
12 Correct 5 ms 16216 KB Output is correct
13 Correct 6 ms 16304 KB Output is correct
14 Correct 9 ms 16220 KB Output is correct

Subtask #3
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 16220 KB Output is correct
2 Correct 11 ms 16216 KB Output is correct
3 Correct 9 ms 16220 KB Output is correct
4 Correct 5 ms 16220 KB Output is correct
5 Correct 6 ms 16356 KB Output is correct
6 Correct 5 ms 16356 KB Output is correct
7 Correct 7 ms 16220 KB Output is correct
8 Correct 5 ms 16220 KB Output is correct
9 Correct 5 ms 16220 KB Output is correct
10 Correct 5 ms 16220 KB Output is correct
11 Correct 5 ms 16220 KB Output is correct
12 Correct 7 ms 16220 KB Output is correct
13 Correct 6 ms 16216 KB Output is correct
14 Correct 5 ms 16216 KB Output is correct

Subtask #4
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 16220 KB Output is correct
2 Correct 11 ms 16216 KB Output is correct
3 Correct 9 ms 16220 KB Output is correct
4 Correct 5 ms 16220 KB Output is correct
5 Correct 6 ms 16356 KB Output is correct
6 Correct 5 ms 16356 KB Output is correct
7 Correct 7 ms 16220 KB Output is correct
8 Correct 6 ms 16220 KB Output is correct
9 Correct 8 ms 16368 KB Output is correct
10 Correct 12 ms 16216 KB Output is correct
11 Correct 5 ms 16220 KB Output is correct
12 Correct 5 ms 16216 KB Output is correct
13 Correct 6 ms 16304 KB Output is correct
14 Correct 9 ms 16220 KB Output is correct
15 Correct 5 ms 16220 KB Output is correct
16 Correct 5 ms 16220 KB Output is correct
17 Correct 5 ms 16220 KB Output is correct
18 Correct 5 ms 16220 KB Output is correct
19 Correct 7 ms 16220 KB Output is correct
20 Correct 6 ms 16216 KB Output is correct
21 Correct 5 ms 16216 KB Output is correct
22 Correct 6 ms 16220 KB Output is correct
23 Correct 5 ms 16352 KB Output is correct
24 Correct 5 ms 16220 KB Output is correct
25 Correct 6 ms 16320 KB Output is correct
26 Correct 5 ms 16472 KB Output is correct
27 Correct 5 ms 16220 KB Output is correct
28 Correct 6 ms 16220 KB Output is correct

Subtask #5
0 / 26.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 16220 KB Output is correct
2 Correct 11 ms 16216 KB Output is correct
3 Correct 9 ms 16220 KB Output is correct
4 Correct 5 ms 16220 KB Output is correct
5 Correct 6 ms 16356 KB Output is correct
6 Correct 5 ms 16356 KB Output is correct
7 Correct 7 ms 16220 KB Output is correct
8 Correct 6 ms 16220 KB Output is correct
9 Correct 8 ms 16368 KB Output is correct
10 Correct 12 ms 16216 KB Output is correct
11 Correct 5 ms 16220 KB Output is correct
12 Correct 5 ms 16216 KB Output is correct
13 Correct 6 ms 16304 KB Output is correct
14 Correct 9 ms 16220 KB Output is correct
15 Correct 9 ms 16220 KB Output is correct
16 Correct 11 ms 16416 KB Output is correct
17 Correct 370 ms 16728 KB Output is correct
18 Incorrect 216 ms 16400 KB Output isn't correct
19 Halted 0 ms 0 KB -

Subtask #6
0 / 36.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 16220 KB Output is correct
2 Correct 11 ms 16216 KB Output is correct
3 Correct 9 ms 16220 KB Output is correct
4 Correct 5 ms 16220 KB Output is correct
5 Correct 6 ms 16356 KB Output is correct
6 Correct 5 ms 16356 KB Output is correct
7 Correct 7 ms 16220 KB Output is correct
8 Correct 6 ms 16220 KB Output is correct
9 Correct 8 ms 16368 KB Output is correct
10 Correct 12 ms 16216 KB Output is correct
11 Correct 5 ms 16220 KB Output is correct
12 Correct 5 ms 16216 KB Output is correct
13 Correct 6 ms 16304 KB Output is correct
14 Correct 9 ms 16220 KB Output is correct
15 Correct 5 ms 16220 KB Output is correct
16 Correct 5 ms 16220 KB Output is correct
17 Correct 5 ms 16220 KB Output is correct
18 Correct 5 ms 16220 KB Output is correct
19 Correct 7 ms 16220 KB Output is correct
20 Correct 6 ms 16216 KB Output is correct
21 Correct 5 ms 16216 KB Output is correct
22 Correct 6 ms 16220 KB Output is correct
23 Correct 5 ms 16352 KB Output is correct
24 Correct 5 ms 16220 KB Output is correct
25 Correct 6 ms 16320 KB Output is correct
26 Correct 5 ms 16472 KB Output is correct
27 Correct 5 ms 16220 KB Output is correct
28 Correct 6 ms 16220 KB Output is correct
29 Correct 9 ms 16220 KB Output is correct
30 Correct 11 ms 16416 KB Output is correct
31 Correct 370 ms 16728 KB Output is correct
32 Incorrect 216 ms 16400 KB Output isn't correct
33 Halted 0 ms 0 KB -