제출 #332408

#제출 시각아이디문제언어결과실행 시간메모리
332408minoumCommuter Pass (JOI18_commuter_pass)C++17
0 / 100
900 ms26860 KiB
#include<bits/stdc++.h> using namespace std; typedef long long int ll; const int MAXN = 2e5 + 10; int n, m, s, t, x, y, parid[MAXN], par[MAXN], uu[MAXN], vv[MAXN]; ll w[MAXN], d[MAXN], d2[MAXN], d3[MAXN], d0[MAXN], d1[MAXN], dpx[MAXN], dpy[MAXN], ans = LLONG_MAX; vector <pair<int,int>> adj[MAXN]; bool mark[MAXN]; inline void dij(int r){ for(int i = 0; i < n; i++) d[i] = LLONG_MAX / 2ll; d[r] = 0; set <pair<ll, int>> st; st.insert({0ll, r}); while(!st.empty()){ int v = st.begin()->second; st.erase(*st.begin()); for(auto i: adj[v]){ int u = i.first, ind = i.second; if(d[u] > d[v] + w[ind]){ st.erase({d[u], u}); d[u] = d[v] + w[ind]; st.insert({d[u], u}); par[u] = v; parid[u] = ind; } } } return; } inline void dij2(int r){ for(int i = 0; i < n; i++) d2[i] = LLONG_MAX / 2ll; d2[r] = 0; set <pair<ll, int>> st; st.insert({0ll, r}); while(!st.empty()){ int v = st.begin()->second; st.erase(*st.begin()); for(auto i: adj[v]){ int u = i.first, ind = i.second; if(d2[u] > d2[v] + w[ind]){ st.erase({d2[u], u}); d2[u] = d2[v] + w[ind]; st.insert({d2[u], u}); par[u] = v; parid[u] = ind; } } } return; } inline void dij3(int r){ for(int i = 0; i < n; i++) d3[i] = LLONG_MAX / 2ll; d3[r] = 0; set <pair<ll, int>> st; st.insert({0ll, r}); while(!st.empty()){ int v = st.begin()->second; st.erase(*st.begin()); for(auto i: adj[v]){ int u = i.first, ind = i.second; if(d3[u] > d3[v] + w[ind]){ st.erase({d3[u], u}); d3[u] = d3[v] + w[ind]; st.insert({d3[u], u}); par[u] = v; parid[u] = ind; } } } return; } inline void dij0(int r){ for(int i = 0; i < n; i++) d0[i] = LLONG_MAX / 2ll; d0[r] = 0; set <pair<ll, int>> st; st.insert({0ll, r}); dpx[r] = d2[r]; dpy[r] = d3[r]; while(!st.empty()){ int v = st.begin()->second; st.erase(*st.begin()); for(auto i: adj[v]){ int u = i.first, ind = i.second; if(d0[u] > d0[v] + w[ind]){ //if((w[i] + d[u] + d2[v] <= d[t]) || (w[i] + d2[u] + d[v] <= d[t])) st.erase({d0[u], u}); d0[u] = d0[v] + w[ind]; st.insert({d0[u], u}); par[u] = v; parid[u] = ind; if(d[t] >= d[u] + d1[u]){ dpx[u] = min(d2[u], dpx[v]); dpy[u] = min(d3[u], dpy[v]); ans = min(dpx[u] + d3[u], ans); ans = min(dpy[u] + d2[u], ans); } } } } return; } inline void dij1(int r){ for(int i = 0; i < n; i++) d1[i] = LLONG_MAX / 2ll; d1[r] = 0; set <pair<ll, int>> st; st.insert({0ll, r}); while(!st.empty()){ int v = st.begin()->second; st.erase(*st.begin()); for(auto i: adj[v]){ int u = i.first, ind = i.second; if(d1[u] > d1[v] + w[ind]){ st.erase({d1[u], u}); d1[u] = d1[v] + w[ind]; st.insert({d1[u], u}); par[u] = v; parid[u] = ind; } } } return; } int main() { ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0); cin >> n >> m >> s >> t >> x >> y; s--; t--; x--; y--; for(int i = 0; i < m; i++){ int u, v; cin >> u >> v >> w[i]; u--; v--; uu[i] = u; vv[i] = v; adj[u].push_back({v, i}); adj[v].push_back({u, i}); } dij2(x); dij3(y); ans = d2[y]; dij(s); dij1(t); dij0(s); cout << ans << endl; return 0; }
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