Submission #166984

#	Time	Username	Problem	Language	Result	Execution time	Memory
166984		Lightning	Evacuation plan (IZhO18_plan)	C++14	23 / 100	853 ms	21928 KiB

plan

#include <iostream>
#include <algorithm>
#include <vector>
#include <cmath>
#include <set>
#include <map>
#include <iomanip>
#include <stack>
#include <queue>
#include <deque>

using namespace std;

typedef long long ll;
typedef pair <int, int> pii;

#define sz(a) (int)a.size()
#define all(a) a.begin(), a.end()
#define pb push_back
#define ppb pop_back
#define mkp make_pair
#define F first
#define S second
#define show(a) cerr << #a <<" -> "<< a <<"\n"
#define fo(a, b, c, d) for(int (a) = (b); (a) <= (c); (a) += (d))
#define foo(a, b, c ,d) for(int (a) = (b); (a) >= (c); (a) -= (d))
//#define int ll

const int N = 2e5;
const int INF = 1e9;

int n, m, d[N], k, q;
vector <pii> g[N];
set <pii> st;

int main () {
	ios_base::sync_with_stdio(false);
//	cin.tie(NULL);
	cin >> n >> m;
	for(int i = 1; i <= m; ++i) {
		int a, b, c;
		cin >> a >> b >> c;
		g[a].pb(mkp(c, b));
		g[b].pb(mkp(c, a));
	}
	for(int i = 1; i <= n; ++i) {
		d[i] = INF;
	}
	cin >> k;
	fo(i, 1, k, 1) {
		int b;
		cin >> b;
		d[b] = 0;
		st.insert(mkp(0, b));
	}
	while(sz(st)) {
		int v = st.begin() -> S;
		st.erase(st.begin());
		for(pii it : g[v]) {
			int w = it.F;
			int to = it.S;
			if(d[to] > d[v] + w) {
				st.erase(mkp(d[to], to));
				d[to] = d[v] + w;
				st.insert(mkp(d[to], to));
			} 
		}
	}
	cin >> q;
	fo(it, 1, q, 1) {
		int s, t;
		cin >> s >> t;
		//show(d[s]);
		//show(d[t]);
		cout << min(d[s], d[t]) <<'\n';
	}
	return 0;
}
/*
9 12
1 9 4
1 2 5
2 3 7
2 4 3
4 3 6
3 6 4
8 7 10
6 7 5
5 8 1
9 5 7
5 4 12
6 8 2
2
4 7
5
*/

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