This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define long long long
#define pii pair<int, int>
#define x first
#define y second
using namespace std;
const int N = 205;
const int M = 5e4+5;
int n, m;
vector<pii> g[N];
array<int, 4> E[M];
long dp[N];
priority_queue<pii, vector<pii>, greater<pii> > Q;
long dijkstra(int s, int e, int i) {
fill_n(dp, N, 1e18);
Q.emplace(dp[s] = 0, s);
while(!Q.empty()) {
pii u = Q.top(); Q.pop();
if(dp[u.y] != u.x) continue;
for(pii v : g[u.y]) {
if(v.y == i) continue;
if(u.x + E[v.y][2] < dp[v.x])
Q.emplace(dp[v.x] = u.x + E[v.y][2], v.x);
}
if(u.y == E[i][1] && u.x + E[i][2] < dp[E[i][0]])
Q.emplace(dp[E[i][0]] = u.x + E[i][2], E[i][0]);
}
return dp[e];
}
int main() {
scanf("%d %d", &n, &m);
for(int i = 1, a, b, c, d; i <= m; i++) {
scanf("%d %d %d %d", &a, &b, &c, &d);
E[i] = {a, b, c, d};
g[a].emplace_back(b, i);
}
long ans = min((long)1e18, dijkstra(1, n, 0) + dijkstra(n, 1, 0));
for(int i = 1; i <= m; i++)
ans = min(ans, dijkstra(1, n, i) + dijkstra(n, 1, i) + E[i][3]);
if(ans >= 1e18) printf("-1\n");
else printf("%lld\n", ans);
return 0;
}
Compilation message (stderr)
ho_t4.cpp: In function 'int main()':
ho_t4.cpp:38:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d", &n, &m);
~~~~~^~~~~~~~~~~~~~~~~
ho_t4.cpp:40:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d %d %d", &a, &b, &c, &d);
~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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