Submission #1094003

#	Time	Username	Problem	Language	Result	Execution time	Memory
1094003		Nurislam	Evacuation plan (IZhO18_plan)	C++17	41 / 100	4090 ms	41244 KiB

plan

#include <bits/stdc++.h>

using namespace std;

#define pb push_back
#define ff first
#define ss second
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define int long long


template <class F, class _S>
bool chmin(F &u, const _S &v){
	bool flag = false;
	if ( u > v ){
		u = v; flag |= true;
	}
	return flag;
}

template <class F, class _S>
bool chmax(F &u, const _S &v){
	bool flag = false;
	if ( u < v ){
		u = v; flag |= true;
	}
	return flag;
}

const int N = 1e6+50, inf = 1e18+200;
//int mod = 998244353;
//int mod = 1000000007;
//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
//#define rnd(l, r) uniform_int_distribution <int> (l, r)(rng)


void solve(){
	int n, m;
	cin >> n >> m;
	vector<vector<array<int, 2>> > g(n+1);
	for (int i = 0; i < m; i++){
		int a, b, w;
		cin >> a >> b >> w;
		g[a].pb({w, b});
		g[b].pb({w, a});
	}
	vector<int> d(n+1, inf);
	auto rere = [&]()->void{
		int k;
		cin >> k;
		priority_queue<array<int, 2>> q;
		for(int i = 0; i < k; i++){
			int x;cin >> x;
			q.push({0, x});
			d[x] = 0;
		}
		while(q.size()){
			auto [dis, ps] = q.top();
			q.pop();
			dis = -dis;
			if(d[ps] < dis)continue;
			
			for(auto [w, to]:g[ps])
				if(chmin(d[to], d[ps] + w))
					q.push({-d[to], to});
		}
	};rere();
	
	auto dfs = [&](int s, int t) -> int{
		priority_queue<array<int,2>> q;
		q.push({d[s], s});
		vector<int> dp(n+1, 0);
		dp[s] = d[s];
		while(q.size()){
			auto [mx, ps] = q.top();
			q.pop();
			//cout << ps << ' ' << mx << '\n';
			if(ps == t)return dp[ps];
			if(mx < dp[ps])continue;
			for(auto [w, to]:g[ps])
				if(chmax(dp[to], min(d[to], dp[ps])))
					q.push({dp[to], to});
		}
		return 0;
		
	};
	
	int q;
	cin >> q;
	while(q--){
		int s, t;
		cin >> s >> t;
		int ans = dfs(s, t);
		cout << ans << '\n';
	}
	
	
}

 
signed main(){
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	cout.tie(nullptr);
	int tt = 1;
	//cin >> tt;
	while(tt--){
		solve();
	}
}
 
 
 
 
 
 
 
 
 
 
 
 
 

• Subtask 1: 10 / 10
• Subtask 2: 0 / 13
• Subtask 3: 12 / 12
• Subtask 4: 19 / 19
• Subtask 5: 0 / 46