제출 #668583

#제출 시각아이디문제언어결과실행 시간메모리
668583Do_you_copyEvacuation plan (IZhO18_plan)C++17
100 / 100
494 ms56696 KiB
/* I find it wholesome to be alone the greater part of the time. To be in company, even with the best, is soon wearisome and dissipating. I love to be alone. I never found the companion that was so companionable as solitude. */ #include <bits/stdc++.h> #define pb push_back #define fi first #define se second #define faster ios_base::sync_with_stdio(0); cin.tie(0); using namespace std; using ll = long long; using ld = long double; using pii = pair <int, int>; mt19937_64 Rand(chrono::steady_clock::now().time_since_epoch().count()); const int maxN = 1e5 + 1; //const int Mod = 1e9 + 7; const ll inf = 0x3f3f3f3f3f3f3f3f; int n, m, k, q; vector <pii> adj[maxN]; vector <int> adj1[maxN]; int g[maxN]; ll ans[maxN]; ll d[maxN]; bool on[maxN]; int idx[maxN]; struct TDSU{ vector <int> lab; TDSU(){} TDSU(int _n){ lab.resize(_n, -1); } inline void resize(int _n){ lab.resize(_n, -1); } inline int find_set(int u){ if (lab[u] < 0) return u; return lab[u] = find_set(lab[u]); } inline bool unite(int u, int v){ u = find_set(u); v = find_set(v); if (u == v) return 0; if (lab[u] > lab[v]) swap(u, v); lab[u] += lab[v]; lab[v] = u; return 1; } }; void Dijkstra(){ memset(d, 0x3f, sizeof(d)); priority_queue <pair <ll, int>, vector <pair <ll, int>>, greater <pair <ll, int>>> PQ; for (int i = 1; i <= k; ++i){ PQ.push({0, g[i]}); d[g[i]] = 0; } while (!PQ.empty()){ auto r = PQ.top(); PQ.pop(); if (d[r.se] != r.fi) continue; for (const pii &i: adj[r.se]){ if (d[r.se] + i.se < d[i.fi]){ d[i.fi] = d[r.se] + i.se; PQ.push({d[i.fi], i.fi}); } } } } int lift[maxN][20]; ll val[maxN][20]; int depth[maxN]; void dfs(int u, int p){ depth[u] = depth[p] + 1; lift[u][0] = p; val[u][0] = d[u]; for (int i = 1; i < 20; ++i){ lift[u][i] = lift[lift[u][i - 1]][i - 1]; val[u][i] = min(val[u][i - 1], val[lift[u][i - 1]][i - 1]); } for (int i: adj1[u]){ if (i == p) continue; dfs(i, u); } } int lca(int u, int v){ if (depth[u] < depth[v]) swap(u, v); int k = depth[u] - depth[v]; ll res = inf; while (k){ int t = __builtin_ctz(k); res = min(res, val[u][t]); u = lift[u][t]; k ^= 1 << t; } if (u == v) return min(res, d[u]); for (int i = 19; i >= 0; --i){ if (lift[u][i] != lift[v][i]){ res = min(res, val[u][i]); res = min(res, val[v][i]); u = lift[u][i]; v = lift[v][i]; } } return min(res, min(val[v][1], val[u][1])); } void Init(){ cin >> n >> m; TDSU dsu(n + 1); for (int i = 1; i <= m; ++i){ int u, v, w; cin >> u >> v >> w; adj[u].pb({v, w}); adj[v].pb({u, w}); } cin >> k; for (int i = 1; i <= k; ++i) cin >> g[i]; Dijkstra(); iota(idx + 1, idx + n + 1, 1); sort(idx + 1, idx + n + 1,[&](const int &i, const int &j){ return d[i] > d[j]; }); for (int i = 1; i <= n; ++i){ on[idx[i]] = 1; for (auto j: adj[idx[i]]){ if (!on[j.fi]) continue; if (dsu.unite(idx[i], j.fi)){ adj1[idx[i]].pb(j.fi); adj1[j.fi].pb(idx[i]); } } } dfs(1, 0); cin >> q; for (int i = 1; i <= q; ++i){ int s, t; cin >> s >> t; cout << lca(s, t) << "\n"; } } #define debug #define taskname "test" signed main(){ faster if (fopen(taskname".inp", "r")){ freopen(taskname".inp", "r", stdin); freopen(taskname".out", "w", stdout); } int tt = 1; //cin >> tt; while (tt--){ Init(); } if (fopen("timeout.txt", "r")){ ofstream timeout("timeout.txt"); timeout << signed(double(clock()) / CLOCKS_PER_SEC * 1000); timeout.close(); #ifndef debug cerr << "Time elapsed: " << signed(double(clock()) / CLOCKS_PER_SEC * 1000) << "ms\n"; #endif // debug } }

컴파일 시 표준 에러 (stderr) 메시지

plan.cpp: In function 'int main()':
plan.cpp:150:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  150 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
plan.cpp:151:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  151 |         freopen(taskname".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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