結果
問題 | No.1769 Don't Stop the Game |
ユーザー |
|
提出日時 | 2021-10-22 16:23:09 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 816 ms / 3,000 ms |
コード長 | 1,955 bytes |
コンパイル時間 | 2,611 ms |
コンパイル使用メモリ | 213,896 KB |
最終ジャッジ日時 | 2025-01-25 02:50:51 |
ジャッジサーバーID (参考情報) |
judge3 / judge4 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 28 |
ソースコード
#include <bits/stdc++.h>using namespace std;using ll = long long;#define rep(i,n) for(int i=0;i<n;++i)int main() {int n; cin >> n;vector<vector<pair<int, int>>> g(n);rep(i, n - 1) {int a, b, c; cin >> a >> b >> c;--a, --b;g[a].emplace_back(b, c);g[b].emplace_back(a, c);}vector<int> siz(n, 1), x(n);auto dfs0 = [&](auto&& f, int cur, int par)->void {for (auto [to, weight] : g[cur]) {if (to == par)continue;x[to] = x[cur] ^ weight;f(f, to, cur);siz[cur] += siz[to];}};dfs0(dfs0, 0, -1);auto sorted_x = x;sort(sorted_x.begin(), sorted_x.end());rep(i, n)x[i] = lower_bound(sorted_x.begin(), sorted_x.end(), x[i]) - sorted_x.begin();//compressll ans = ll(n) * (n - 1);auto dfs1 = [&](auto&& f, int cur, int par)->map<int, pair<int, int>> {map<int, pair<int, int>> L;//{y,cnt}for (auto [to, weight] : g[cur]) {if (to == par)continue;auto R = f(f, to, cur);if (R.count(x[cur])) {ans -= ll(R[x[cur]].second) * (n - siz[to]);//case-2ans -= ll(R[x[cur]].first) * R[x[cur]].second;//case-3}if (L.size() > R.size())swap(L, R);for (auto [l_XOR, val] : L) {auto [y, cnt] = val;R[l_XOR].first += y;R[l_XOR].second += cnt;}swap(L, R);}if (L.count(x[cur])) {ans -= L[x[cur]].first;//case-1}L[x[cur]] = { siz[cur],1 };if (cur == 0) {for (auto [l_XOR, val] : L) {auto [y, cnt] = val;if (l_XOR != x[cur])ans -= ll(y) * cnt;//case-3}}else ans += siz[cur];//case-3return L;};dfs1(dfs1, 0, -1);cout << ans << "\n";return 0;}