#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll, int> ii;
const int maxn = 1e5 + 10;
vector<int> adj[maxn], cost[maxn];
vector<ll> du, dv, dt, ds, dp1, dp2;
void dijkstra(int s, int n, vector<ll> &d) {
for(int i = 0; i < n; i++) d[i] = 1e18;
priority_queue<ii, vector<ii>, greater<ii> > q;
q.push({d[s] = 0, s});
while(!q.empty()) {
ii x = q.top(); q.pop();
int u = x.second; ll c = x.first;
for(int i = 0; i < adj[u].size(); i++) {
int v = adj[u][i]; ll w = cost[u][i];
if(d[v] > c + w) {
d[v] = c + w;
q.push({d[v], v});
}
}
}
}
void compute(int s, int n, vector<ll> &dp) {
dp.resize(n + 1);
vector<ll> d(n + 1);
for(int i = 1; i <= n; i++) {
dp[i] = du[i];
d[i] = 1e18;
}
priority_queue<ii, vector<ii>, greater<ii> > q;
q.push({d[s] = 0, s});
while(!q.empty()) {
ii x = q.top(); q.pop();
int u = x.second; ll c = x.first;
for(int i = 0; i < adj[u].size(); i++) {
int v = adj[u][i]; ll w = cost[u][i];
if(d[v] == c + w) {
// cout << u << " -> " << v << " ";
d[v] = c + w;
dp[v] = min(dp[v], dp[u]);
q.push({d[v], v});
// cout << dp[u] << " " << dp[v] << endl;
} else if(d[v] > c + w) {
// cout << u << " -> " << v << " " ;
d[v] = c + w;
dp[v] = min(du[v], dp[u]);
q.push({d[v], v});
// cout << dp[u] << " " << dp[v] << endl;
}
}
}
}
int main(int argc, char const *argv[]) {
int n, m, u, v, s, t;
scanf("%d %d", &n, &m);
scanf("%d %d", &s, &t);
scanf("%d %d", &u, &v);
for(int i = 0; i < m; i++) {
int u, v, c;
scanf("%d %d %d", &u, &v, &c);
adj[u].push_back(v);
adj[v].push_back(u);
cost[u].push_back(c);
cost[v].push_back(c);
}
du.resize(n + 1);
dv.resize(n + 1);
ds.resize(n + 1);
dt.resize(n + 1);
dijkstra(u, n + 1, du);
dijkstra(v, n + 1, dv);
dijkstra(s, n + 1, ds);
dijkstra(t, n + 1, dt);
compute(s, n, dp1);
compute(t, n, dp2);
ll Min = 1e18;
for(int i = 1; i <= n; i++) {
if(ds[t] == ds[i] + dt[i]) {
Min = min(Min, dv[i] + min(dp1[i], dp2[i]));
}
}
cout << min(Min, du[v]) << endl;
}
Compilation message
commuter_pass.cpp: In function 'void dijkstra(int, int, std::vector<long long int>&)':
commuter_pass.cpp:18:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i = 0; i < adj[u].size(); i++) {
^
commuter_pass.cpp: In function 'void compute(int, int, std::vector<long long int>&)':
commuter_pass.cpp:41:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i = 0; i < adj[u].size(); i++) {
^
commuter_pass.cpp: In function 'int main(int, const char**)':
commuter_pass.cpp:62:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d", &n, &m);
^
commuter_pass.cpp:63:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d", &s, &t);
^
commuter_pass.cpp:64:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d", &u, &v);
^
commuter_pass.cpp:67:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d %d", &u, &v, &c);
^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
662 ms |
22108 KB |
Output is correct |
| 2 |
Execution timed out |
2051 ms |
262144 KB |
Time limit exceeded |
| 3 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
680 ms |
262144 KB |
Output is correct |
| 2 |
Correct |
732 ms |
262144 KB |
Output is correct |
| 3 |
Correct |
749 ms |
262144 KB |
Output is correct |
| 4 |
Correct |
733 ms |
262144 KB |
Output is correct |
| 5 |
Correct |
775 ms |
262144 KB |
Output is correct |
| 6 |
Correct |
691 ms |
262144 KB |
Output is correct |
| 7 |
Correct |
733 ms |
262144 KB |
Output is correct |
| 8 |
Correct |
689 ms |
262144 KB |
Output is correct |
| 9 |
Correct |
717 ms |
262144 KB |
Output is correct |
| 10 |
Correct |
734 ms |
262144 KB |
Output is correct |
| 11 |
Correct |
279 ms |
262144 KB |
Output is correct |
| 12 |
Correct |
661 ms |
262144 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
997 ms |
262144 KB |
Execution killed with signal 11 (could be triggered by violating memory limits) |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
662 ms |
22108 KB |
Output is correct |
| 2 |
Execution timed out |
2051 ms |
262144 KB |
Time limit exceeded |
| 3 |
Halted |
0 ms |
0 KB |
- |
