제출 #211549

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
211549		NachoLibre	Commuter Pass (JOI18_commuter_pass)	C++14	0 / 100	506 ms	23032 KiB

commuter_pass

#include <bits/stdc++.h>
using namespace std;

const int N = 100005, M = 200005;
const long long inf = 1e18;
int n, m, s, t, u, v, x, y, z;
vector<int> e[N][2];
vector<long long> o[4];
long long fp;

vector<long long> D(int rt) {
	vector<long long> dr;
	dr.resize(n + 1, inf);
	dr[rt] = 0;
	set<pair<long long, int> > s;
	s.insert({0, rt});
	while(s.size()) {
		int dg = (*s.begin()).second;
		long long mn = (*s.begin()).first;
		s.erase(s.begin());
		for(int i = 0; i < e[dg][0].size(); ++i) {
			if(mn + e[dg][1][i] < dr[e[dg][0][i]]) {
				if(dr[e[dg][0][i]] ^ inf) s.erase(s.find({dr[e[dg][0][i]], e[dg][0][i]}));
				dr[e[dg][0][i]] = mn + e[dg][1][i];
				s.insert({dr[e[dg][0][i]], e[dg][0][i]});
			}
		}
	}
	return dr;
}

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cin >> n >> m >> s >> t >> u >> v;
	for(int i = 1; i <= m; ++i) {
		cin >> x >> y >> z;
		e[x][0].push_back(y);
		e[x][1].push_back(z);
		e[y][0].push_back(x);
		e[y][1].push_back(z);
	}
	o[0] = D(s);
	o[1] = D(t);
	// o[2] = D(u);
	o[3] = D(v);
	fp = o[s][v];
	for(int i = 1; i <= n; ++i) {
		if(o[0][i] + o[1][i] == o[0][t]) {
			fp = min(fp, o[3][i]);
		}
	}
	cout << fp << endl;
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

commuter_pass.cpp: In function 'std::vector<long long int> D(int)':
commuter_pass.cpp:21:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i = 0; i < e[dg][0].size(); ++i) {
                  ~~^~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 16
• Subtask 2: 0 / 15
• Subtask 3: 0 / 24
• Subtask 4: 0 / 45