結果
問題 | No.898 tri-βutree |
ユーザー | ldsyb |
提出日時 | 2019-10-05 17:04:23 |
言語 | C++14 (gcc 12.3.0 + boost 1.83.0) |
結果 |
WA
|
実行時間 | - |
コード長 | 1,990 bytes |
コンパイル時間 | 1,706 ms |
コンパイル使用メモリ | 181,912 KB |
実行使用メモリ | 36,864 KB |
最終ジャッジ日時 | 2024-10-06 05:51:38 |
合計ジャッジ時間 | 11,576 ms |
ジャッジサーバーID (参考情報) |
judge4 / judge5 |
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テストケース
テストケース表示入力 | 結果 | 実行時間 実行使用メモリ |
---|---|---|
testcase_00 | AC | 312 ms
36,096 KB |
testcase_01 | AC | 2 ms
6,816 KB |
testcase_02 | WA | - |
testcase_03 | WA | - |
testcase_04 | WA | - |
testcase_05 | WA | - |
testcase_06 | WA | - |
testcase_07 | WA | - |
testcase_08 | WA | - |
testcase_09 | WA | - |
testcase_10 | WA | - |
testcase_11 | WA | - |
testcase_12 | WA | - |
testcase_13 | WA | - |
testcase_14 | WA | - |
testcase_15 | WA | - |
testcase_16 | WA | - |
testcase_17 | WA | - |
testcase_18 | WA | - |
testcase_19 | WA | - |
testcase_20 | WA | - |
testcase_21 | WA | - |
ソースコード
#include <bits/stdc++.h> using namespace std; int main() { int64_t n; cin >> n; vector<vector<pair<int64_t, int64_t>>> g(n); for (int64_t i = 0; i < n - 1; i++) { int64_t a, b, c; cin >> a >> b >> c; g[a].push_back({b, c}); g[b].push_back({a, c}); } vector<int64_t> depth(n), dist(n); vector<vector<int64_t>> pre(30, vector<int64_t>(n)); { stack<int64_t> st; vector<bool> done(n, false); depth[0] = 0; dist[0] = 0; done[0] = true; pre[0][0] = 0; st.emplace(0); while (!st.empty()) { int64_t v = st.top(); st.pop(); for (auto &&p : g[v]) { if (done[p.first]) { continue; } depth[p.first] = depth[v] + 1; dist[p.first] = dist[v] + p.second; done[p.first] = true; pre[0][p.first] = v; st.emplace(p.first); } } for (int64_t i = 1; i < 30; i++) { for (int64_t j = 0; j < n; j++) { pre[i][j] = pre[i - 1][pre[i - 1][j]]; } } } auto lca = [&](int64_t x, int64_t y) { for (int64_t diff = max(int64_t(0), depth[y] - depth[x]), tmp = 0; diff; diff >>= 1, tmp++) { if (diff & 1) { y = pre[tmp][y]; } } for (int64_t diff = max(int64_t(0), depth[x] - depth[y]), tmp = 0; diff; diff >>= 1, tmp++) { if (diff & 1) { x = pre[tmp][x]; } } if (x == y) { return x; } else { int64_t ok = 29, ng = -1; while (1 < abs(ok - ng)) { int64_t mid = (ok + ng) / 2; ((pre[mid][x] == pre[mid][y]) ? ok : ng) = mid; } return pre[ok][x]; } }; int64_t q; cin >> q; for (int64_t _ = 0; _ < q; _++) { int64_t x, y, z; cin >> x >> y >> z; int64_t a = min({lca(x, y), lca(x, z), lca(y, z)}); int64_t b = max({lca(x, y), lca(x, z), lca(y, z)}); int64_t c = lca(a, b); if (a == b) { cout << (dist[x] - dist[c]) + (dist[y] - dist[c]) + (dist[z] - dist[c]) << endl; } else { cout << (dist[x] - dist[c]) + (dist[y] - dist[c]) + (dist[z] - dist[c]) - abs(dist[a] - dist[b]) << endl; } } return 0; }