Submission #1198908

#TimeUsernameProblemLanguageResultExecution timeMemory
1198908hoa208Robot (JOI21_ho_t4)C++20
34 / 100
3095 ms57120 KiB
#include<bits/stdc++.h> using namespace std; #define ll long long #define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; i++) #define FORD(i, b, a) for (int i = (b), _a = (a); i >= _a; i--) #define pa pair<ll, ll> #define fi first #define se second #define bit(mask, j) ((mask >> j) & 1) #define t_test int t;cin >> t;while(t--) const ll mod = 1e9 + 7; const ll INF = 1e18; inline void adm(ll &x){if(x>=mod)x%=mod;else if(x<0)x+=mod;} //-------------------------------------------------------------------- const ll N = 1e5 + 10; ll n, m; struct edge { ll v, c, p; }; struct state { ll cost, u, c; bool operator < (const state & a) const { return cost > a.cost; } }; vector<edge> g[N]; ll d[N]; unordered_map<ll, ll> d2[N], clr[N]; void DJK() { priority_queue<state> q; memset(d, 0x3f, sizeof d); d[1] = 0; q.push({0, 1, 0}); while(!q.empty()) { ll u = q.top().u, cost = q.top().cost, c = q.top().c; q.pop(); if(c != 0) { if(d2[u][c] != cost) continue; for(auto e : g[u]) { ll v = e.v, _c = e.c, p = e.p; if(_c != c) continue; ll val = cost + clr[u][_c] - p; if(d[v] > val) { d[v] = val; q.push({d[v], v, 0}); } } } else { if(cost != d[u]) continue; if(u == n) { cout << cost; exit(0); } for(auto e : g[u]) { ll v = e.v, _c = e.c, p = e.p; ll val = cost + clr[u][_c] - p; if(d[v] > val) { d[v] = val; q.push({d[v], v, 0}); } val = cost + p; if(d[v] > val) { d[v] = val; q.push({d[v], v, 0}); } val = cost; if(d2[v].find(_c) == d2[v].end() || d2[v][_c] > val) { d2[v][_c] = val; q.push({d2[v][_c], v, _c}); } } } } } void hbmt() { cin >> n >> m; FOR(i, 1, m) { ll u, v, c, p; cin >> u >> v >> c >> p; g[u].push_back({v, c, p}); g[v].push_back({u, c, p}); clr[u][c] += p; clr[v][c] += p; } DJK(); cout << -1; } int main() { ios_base::sync_with_stdio(0); cin.tie(0);cout.tie(0); if(fopen("hbmt.inp", "r")) { freopen("hbmt.inp", "r", stdin); freopen("hbmt.out", "w", stdout); } // t_test hbmt(); return 0; }

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:96:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   96 |         freopen("hbmt.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:97:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   97 |         freopen("hbmt.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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