結果
問題 | No.1637 Easy Tree Query |
ユーザー | first_vil |
提出日時 | 2021-08-06 21:56:07 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 76 ms / 2,000 ms |
コード長 | 3,857 bytes |
コンパイル時間 | 2,697 ms |
コンパイル使用メモリ | 199,060 KB |
最終ジャッジ日時 | 2025-01-23 15:14:35 |
ジャッジサーバーID (参考情報) |
judge2 / judge6 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 2 |
other | AC * 33 |
ソースコード
#include <bits/stdc++.h> using namespace std; using ll = long long; using ld = long double; template<class T> using V = vector<T>; using VI = V<int>; using VL = V<ll>; using VS = V<string>; template<class T> using PQ = priority_queue<T, V<T>, greater<T>>; using graph = V<VI>; template<class T> using w_graph = V<V<pair<int, T>>>; #define FOR(i,a,n) for(int i=(a);i<(n);++i) #define eFOR(i,a,n) for(int i=(a);i<=(n);++i) #define rFOR(i,a,n) for(int i=(n)-1;i>=(a);--i) #define erFOR(i,a,n) for(int i=(n);i>=(a);--i) #define all(a) a.begin(),a.end() #define rall(a) a.rbegin(),a.rend() #define out(y,x) ((y)<0||h<=(y)||(x)<0||w<=(x)) #ifdef _DEBUG #define line cout << "-----------------------------\n" #define stop system("pause") #endif constexpr ll INF = 1000000000; constexpr ll LLINF = 1LL << 61; constexpr ll mod = 1000000007; constexpr ll MOD = 998244353; constexpr ld eps = 1e-10; template<class T>inline bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; }return false; } template<class T>inline bool chmin(T& a, const T& b) { if (a > b) { a = b; return true; }return false; } inline void init() { cin.tie(nullptr); cout.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(15); } template<class T>inline istream& operator>>(istream& is, V<T>& v) { for (auto& a : v)is >> a; return is; } template<class T, class U>inline istream& operator>>(istream& is, pair<T, U>& p) { is >> p.first >> p.second; return is; } template<class T>inline V<T> vec(size_t a) { return V<T>(a); } template<class T>inline V<T> defvec(T def, size_t a) { return V<T>(a, def); } template<class T, class... Ts>inline auto vec(size_t a, Ts... ts) { return V<decltype(vec<T>(ts...))>(a, vec<T>(ts...)); } template<class T, class... Ts>inline auto defvec(T def, size_t a, Ts... ts) { return V<decltype(defvec<T>(def, ts...))>(a, defvec<T>(def, ts...)); } template<class T>inline void print(const T& a) { cout << a << "\n"; } template<class T, class... Ts>inline void print(const T& a, const Ts&... ts) { cout << a << " "; print(ts...); } template<class T>inline void print(const V<T>& v) { for (int i = 0; i < v.size(); ++i)cout << v[i] << (i == v.size() - 1 ? "\n" : " "); } template<class T>inline void print(const V<V<T>>& v) { for (auto& a : v)print(a); } template<class T>inline T sum(const V<T>& a, int l, int r) { return 0 <= l && l <= r && r < a.size() ? a[r] - (l == 0 ? 0 : a[l - 1]) : 0; } template<class T>inline void END(T s) { print(s); exit(0); } void END() { exit(0); } class unionfind { VI par, rank; int forest_num; public: unionfind(const int& n) : par(n), rank(n, 1), forest_num(n) { FOR(i, 0, n)par[i] = i; } int root(int x) { if (par[x] == x)return x; return par[x] = root(par[x]); } int size(int x) { if (par[x] == x)return rank[x]; return size(par[x]); } void unite(int x, int y) { int rx = root(x), ry = root(y); if (rx == ry)return; if (rank[rx] < rank[ry]) { par[rx] = ry; rank[ry] += rank[rx]; } else { par[ry] = rx; rank[rx] += rank[ry]; } --forest_num; } bool same(int x, int y) { return root(x) == root(y); } int fnum() { return forest_num; } }; int main() { init(); int n, q; cin >> n >> q; graph g(n); FOR(i, 0, n - 1) { int a, b; cin >> a >> b; --a, --b; g[a].push_back(b); g[b].push_back(a); } VL siz(n, 1); auto dfs = [&](auto&& f, int cur, int par)->ll { for (int to : g[cur]) { if (to == par)continue; siz[cur] += f(f, to, cur); } return siz[cur]; }; dfs(dfs, 0, -1); ll ans = 0; while (q--) { int p; ll x; cin >> p >> x; print(ans += siz[--p] * x); } return 0; }