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/*
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*/
#include"bits/stdc++.h"
#pragma GCC optimize("O3", "unroll-loops")
#define ll long long
#define ld long double
#define f first
#define s second
#define db double
#define time_begin() auto begin = chrono::high_resolution_clock::now()
#define time_end() auto end = chrono::high_resolution_clock::now(); auto elapsed = chrono::duration_cast<chrono::nanoseconds>(end-begin); auto sec = elapsed.count() * 1e-9; cerr << "\n\nExecution time: " << sec << " seconds";
#define check_time() cerr << "\nStatus : "; if (sec>1) cerr << "Time Limit Exceeded 1!!!1!111"; else cerr << "You good brother"
#define precision(x) fixed << setprecision((x))
#define check_ok(s) cout << s << " is aight" << '\n'
#define pii pair<int, int>
#define mp make_pair
using namespace std;
void setIO(string s = ""){
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
if (!s.empty()){
freopen((s+".in").c_str(), "r", stdin);
freopen((s+".out").c_str(), "w", stdout);
}
}
const ll inf = 1e18;
vector<pair<ll, int>> G[400001];
vector<pair<int, pair<ll, int>>> adj[100001];
ll dis[400001];
int main(){
int n, m;
cin >> n >> m;
for (int i = 0; i < m; i++){
int a, b, c;
ll p;
cin >> a >> b >> c >> p;
adj[a].push_back(mp(c, mp(p, b)));
adj[b].push_back(mp(c, mp(p, a)));
}
int node = n;
for (int i = 1; i <= n; i++){
int sz = adj[i].size();
if (!sz) continue;
sort(adj[i].begin(), adj[i].end());
for (int l = 0, r = 0; l < sz; l = r){
ll sum = 0;
while (r < sz && adj[i][l].f == adj[i][r].f) sum += adj[i][r++].s.f;
if (r - l == 1) G[i].push_back(mp(0, adj[i][l].s.s));
else {
node++;
G[i].push_back(mp(0, node));
for (int x = l; x < r; x++){
pair<ll, int> p = adj[i][x].s;
G[i].push_back(p);
// G[p.s].push_back(mp(0, node));
G[node].push_back(mp(sum - p.f, p.s));
}
}
}
}
priority_queue<pair<ll, int>> pq;
pq.push(mp(0, 1));
for (int i = 0; i <= 400000; i++) dis[i] = inf;
dis[1] = 0;
while (!pq.empty()){
pair<ll, int> p = pq.top();
pq.pop();
if (-p.f > dis[p.s]) continue;
int u = p.s;
for (auto &[w, v] : G[u]){
if (-p.f + w < dis[v]){
dis[v] = w - p.f;
pq.push(mp(p.f - w, v));
}
}
}
cout << (dis[n] >= inf ? -1 : dis[n]);
}
컴파일 시 표준 에러 (stderr) 메시지
Main.cpp: In function 'void setIO(std::string)':
Main.cpp:144:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
144 | freopen((s+".in").c_str(), "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:145:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
145 | freopen((s+".out").c_str(), "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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