This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
//Nguyen Huu Hoang Minh
#include <bits/stdc++.h>
#define sz(x) int(x.size())
#define all(x) x.begin(),x.end()
#define reset(x) memset(x, 0,sizeof(x))
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define N 2005
#define remain(x) if (x > MOD) x -= MOD
#define ii pair<int, int>
#define iiii pair< ii , ii >
#define viiii vector< iiii >
#define vi vector<int>
#define vii vector< ii >
#define bit(x, i) (((x) >> (i)) & 1)
#define Task "test"
#define int long long
using namespace std;
typedef long double ld;
const int inf = 1e10;
const int minf = -1e10;
int n, m;
struct edge{
int v, z, p;
};
map<int, vector<edge>> g[100005];
int d[100005];
map<int,int> d2[100005], psum[100005];
void readfile()
{
ios_base::sync_with_stdio(false);
cin.tie(0);cout.tie(0);
if (fopen(Task".inp","r"))
{
freopen(Task".inp","r",stdin);
//freopen(Task".out","w",stdout);
}
cin >> n >> m;
for(int i=1; i<=m; i++){
int u, v, z, p;
cin >> u >> v >> z >> p;
g[u][z].pb({v,z,p});
g[v][z].pb({u,z,p});
psum[u][z]+=p;
psum[v][z]+=p;
}
}
void proc()
{
memset(d, 0x3f, sizeof d);
d[1]=0;
priority_queue<tuple<int,int,int>> q;
q.push({0,1,0});
while (q.size()){
int cost, node, c;
tie(cost,node,c) = q.top();
q.pop();
if (c){
if (d2[node][c]!=-cost) continue;
for(edge i : g[node][c]){
int case1 = psum[node][c]-i.p-cost;
if (case1 < d[i.v]){
d[i.v] = case1;
q.push({-d[i.v],i.v,0});
}
}
}
else{
if (d[node]!=-cost) continue;
for(auto &i : g[node]){
for(auto j : i.se){
int case1 = psum[node][j.z]-j.p-cost;
if (case1 < d[j.v]){
d[j.v] = case1;
q.push({-d[j.v],j.v,0});
}
int case2 = j.p-cost;
if (case2 < d[j.v]){
d[j.v] = case2;
q.push({-d[j.v],j.v,0});
}
int case3 = -cost;
if (case3 < d2[j.v][j.z] || !d2[j.v].count(j.z)){
d2[j.v][j.z] = case3;
q.push({-d2[j.v][j.z],j.v,j.z});
}
}
}
}
}
cout << (d[n] > 1e18 ? -1 : d[n]);
}
signed main()
{
readfile();
proc();
return 0;
}
Compilation message (stderr)
Main.cpp: In function 'void readfile()':
Main.cpp:41:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
41 | freopen(Task".inp","r",stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
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