Submission #1055238

#TimeUsernameProblemLanguageResultExecution timeMemory
1055238Alihan_8Olympic Bus (JOI20_ho_t4)C++17
100 / 100
977 ms5220 KiB
#include <bits/stdc++.h> using namespace std; #define all(x) x.begin(), x.end() #define ar array #define pb push_back #define ln '\n' //~ #define int long long using i64 = long long; template <class F, class _S> bool chmin(F &u, const _S &v){ bool flag = false; if ( u > v ){ u = v; flag |= true; } return flag; } template <class F, class _S> bool chmax(F &u, const _S &v){ bool flag = false; if ( u < v ){ u = v; flag |= true; } return flag; } const i64 inf = 1e12; signed main(){ ios_base::sync_with_stdio(false); cin.tie(nullptr); int n, m; cin >> n >> m; // subtask #2 vector <int> U(m), V(m), C(m), D(m); for ( int i = 0; i < m; i++ ){ cin >> U[i] >> V[i] >> C[i] >> D[i]; --U[i], --V[i]; } vector <int> is(m); auto get = [&](auto U, auto V, auto C, int sx, int rev = -1){ vector <vector<ar<int,3>>> adj(n); for ( int i = 0; i < (int)U.size(); i++ ){ int u = U[i], v = V[i]; if ( i == rev ) swap(u, v); adj[u].pb({v, C[i], i}); } vector <i64> dp(n, inf); vector <int> fa(n, -1); priority_queue <pair<i64,int>> q; q.push({0, sx}); dp[sx] = 0; while ( !q.empty() ){ auto [val, u] = q.top(); q.pop(); if ( -val != dp[u] ) continue; for ( auto &[v, w, j]: adj[u] ){ if ( chmin(dp[v], dp[u] + w) ){ q.push({-dp[v], v}); fa[v] = j; } } } for ( auto &x: fa ){ if ( x != -1 ) is[x] = 1; } return dp; }; auto f = [&](int j){ return get(U, V, C, 0, j)[n - 1] + get(U, V, C, n - 1, j)[0] + D[j]; }; int s = 0, e = n - 1; auto fs = get(U, V, C, s), fe = get(U, V, C, e); auto IS = is; auto ts = get(V, U, C, s), te = get(V, U, C, e); i64 opt = fs[e] + fe[s]; for ( int i = 0; i < m; i++ ){ i64 x = min(fs[e], fs[V[i]] + C[i] + te[U[i]]); i64 y = min(fe[s], fe[V[i]] + C[i] + ts[U[i]]); if ( IS[i] ){ chmin(opt, f(i)); } else{ chmin(opt, x + y + D[i]); } } if ( opt >= inf ){ opt = -1; } cout << opt; cout << '\n'; }
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