제출 #907868

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
907868		Nuraly_Serikbay	Evacuation plan (IZhO18_plan)	C++14	12 / 100	185 ms	46164 KiB

plan

//#pragma comment(linker, "/stack:200000000")
//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#include <map>
#include <set>
#include <list>
#include <cmath>
#include <ctime>
#include <deque>
#include <queue>
#include <stack>
#include <string>
#include <bitset>
#include <cstdio>
#include <limits>
#include <vector>
#include <climits>
#include <cstring>
#include <cstdlib>
#include <fstream>
#include <numeric>
#include <sstream>
#include <cassert>
#include <iomanip>
#include <iostream>
#include <algorithm>
#include <stdio.h>
#include <fstream>
#include <unordered_map>
using namespace std;

typedef long long ll;
typedef long double ld;

#define all(x) x.begin(),x.end()
#define pb push_back
#define ent "\n"

#define int long long

const int maxn = (int)2e5 + 13;
const ll inf = (long long)1e18 + 20;
const int mod = (int)1e9 + 7;

int n,m,k,q;
int ans[maxn];
vector<pair<int,int>>g[maxn];
int a[maxn],b[maxn],c[maxn];
int dst[maxn];
int pr[maxn];
int sz[maxn];
int x[maxn],y[maxn];
pair<int,int>qur[maxn];
vector<int>pos[maxn],mid[maxn];

int get(int x){
	if(x == pr[x])return x;
	return pr[x] = get(pr[x]);
}

void unite(int x,int y){
	x = get(x),y= get(y);
	if(x == y)return ;
	if(sz[x] > sz[y])swap(x,y);
	pr[x] = y;
	sz[y] += sz[x];
}

void solve(){
	cin >> n >> m ;
	for(int i = 1 ; i <= m ; i++){
		int x,y,w;cin >> x >> y >> w;
		g[x].pb({y,w});
		g[y].pb({x,w});
		a[i] = x,b[i] = y,c[i] = w;
	}
	cin >> k;
	set<pair<int,int>>s;
	for(int i = 1 ; i <= n ; i ++){
		dst[i] = inf;
		pr[i] = i;
	}
	for(int i = 1 ; i <= k ; i ++){
		int x;cin >> x;
		s.insert({0,x});
		dst[x] = 0;
	}
	while(s.size()){
		pair<int,int>v = *s.begin();
		s.erase(v);
		for(auto to : g[v.second]){
			int val = dst[v.second] + to.second;
			if(dst[to.first] > val){
				dst[to.first] = val;
				s.insert({val,to.first});
			}
		}
	}
	for(int i = 1 ; i <= m ; i ++){
		pos[min(dst[a[i]],dst[b[i]])].pb(i);
	}
	cin >> q;
	for(int i = 1 ; i <= q ; i ++){
		cin >> x[i] >> y[i];
		qur[i] = {0,2000};
	}
	for(int I = 1 ; I <= 20 ; I ++){
		for(int i = 0 ; i <= 2000 ; i ++)mid[i].clear();
		for(int i = 1  ; i <= n ; i ++){
			pr[i] = i;
			sz[i] = 1;
		}
		for(int i = 1 ; i <= q ; i ++){
			if(qur[i].first <= qur[i].second){
				int m = (qur[i].first + qur[i].second) >> 1;
				mid[m].pb(i);			}
		}
		for(int i = 2000 ; i >= 0 ; i --){
			for(auto to : pos[i]){
				unite(a[to],b[to]);
			}
			for(auto to : mid[i]){
				if(get(x[to]) == get(y[to])){
					qur[to].first = i + 1;
					ans[to] = i;
				}
				else{
					qur[to].second = i - 1;
				}
			}
		}
	}
	for(int i = 1 ; i <= q ;  i++){
		cout << ans[i] << ent;
	}
}

signed main(){
	// freopen ("hps.in", "r", stdin);
	// freopen ("hps.out", "w", stdout);
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int t = 1;
	//cin >> t;
	int test = 0;
	while(t --){
	//	cout << "Case " << ++test << ": ";
		solve();
	}
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

plan.cpp: In function 'int main()':
plan.cpp:145:6: warning: unused variable 'test' [-Wunused-variable]
  145 |  int test = 0;
      |      ^~~~

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