Submission #1112338

#	Time	Username	Problem	Language	Result	Execution time	Memory
1112338		thelegendary08	Highway Tolls (IOI18_highway)	C++17	5 / 100	104 ms	9140 KiB

highway

#include "highway.h"
#include<bits/stdc++.h>
#define vi vector<int>
#define vb vector<bool>
#define vpii vector<pair<int,int>>
#define pb push_back
#define vvi vector<vector<int>>
#define ll long long int
#define f0r(i,n) for(int i = 0; i<n; i++)
#define vout(v) for(auto u : v)cout<<u<<' '; cout<<'\n';
using namespace std;
void find_pair(int N, std::vector<int> U, std::vector<int> V, int A, int B) {
	int m = U.size();
	ll ret;
	vi w(m,0);
	ret = ask(w);
	int base = ret;
	int len = ret/A;
	vi dep(N);
	dep[0] = 0;
	queue<int>q;
	q.push(0);
	vb vis(N);
	vis[0] = 1;
	vpii adj[N];
	f0r(i, m){
		adj[U[i]].pb({V[i], i});
		adj[V[i]].pb({U[i], i});
	}
	vi par(N, -1);
	while(!q.empty()){
		int cur = q.front();
		q.pop();
		for(auto u : adj[cur]){
			if(vis[u.first])continue;
			par[u.first] = u.second;
			vis[u.first] = 1;
			dep[u.first] = dep[cur] + 1;
			q.push(u.first);
		}
	}
	//vout(par);
	
	vi poss;
	f0r(i, N){
		if(dep[i] == len)poss.pb(i);
	}
	//vout(poss);
	
	int l = 0;
	int r = poss.size() - 1;
	while(l < r){
		vi w(m, 0);
		int mid = (l + r)/2;
		//set l to mid
		for(int i = l; i<=mid; i++){
			w[par[poss[i]]] = 1;
		}
		ret = ask(w);
		if(ret > base){
			r = mid;
		}
		else{
			l = mid + 1;
		}
	}
  	answer(0, poss[l]);
  	
}

• Subtask 1: 5 / 5
• Subtask 2: 0 / 7
• Subtask 3: 0 / 6
• Subtask 4: 0 / 33
• Subtask 5: 0 / 18
• Subtask 6: 0 / 31