結果
| 問題 |
No.1637 Easy Tree Query
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2021-08-06 21:30:00 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 89 ms / 2,000 ms |
| コード長 | 5,227 bytes |
| コンパイル時間 | 2,446 ms |
| コンパイル使用メモリ | 202,028 KB |
| 最終ジャッジ日時 | 2025-01-23 14:38:29 |
|
ジャッジサーバーID (参考情報) |
judge4 / judge5 |
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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>
#ifdef DEBUG
#include <Mylib/Debug/debug.cpp>
#else
#define dump(...) ((void)0)
#endif
template <typename T, typename U>
bool chmin(T &a, const U &b) {
return (a > b ? a = b, true : false);
}
template <typename T, typename U>
bool chmax(T &a, const U &b) {
return (a < b ? a = b, true : false);
}
template <typename T, size_t N, typename U>
void fill_array(T (&a)[N], const U &v) {
std::fill((U *) a, (U *) (a + N), v);
}
template <typename T, size_t N, size_t I = N>
auto make_vector(const std::array<int, N> &a, T value = T()) {
static_assert(I >= 1);
static_assert(N >= 1);
if constexpr (I == 1) {
return std::vector<T>(a[N - I], value);
} else {
return std::vector(a[N - I], make_vector<T, N, I - 1>(a, value));
}
}
template <typename T>
std::ostream &operator<<(std::ostream &s, const std::vector<T> &a) {
for (auto it = a.begin(); it != a.end(); ++it) {
if (it != a.begin()) s << " ";
s << *it;
}
return s;
}
template <typename T>
std::istream &operator>>(std::istream &s, std::vector<T> &a) {
for (auto &x : a) s >> x;
return s;
}
std::string YesNo(bool value) { return value ? "Yes" : "No"; }
std::string YESNO(bool value) { return value ? "YES" : "NO"; }
std::string yesno(bool value) { return value ? "yes" : "no"; }
template <typename T>
void putl(const T &value) {
std::cout << value << "\n";
}
template <typename Head, typename... Tail>
void putl(const Head head, const Tail &... tail) {
std::cout << head << " ";
putl(tail...);
}
namespace haar_lib {
template <typename T>
struct edge {
int from, to;
T cost;
int index = -1;
edge() {}
edge(int from, int to, T cost) : from(from), to(to), cost(cost) {}
edge(int from, int to, T cost, int index) : from(from), to(to), cost(cost), index(index) {}
};
template <typename T>
struct graph {
using weight_type = T;
using edge_type = edge<T>;
std::vector<std::vector<edge<T>>> data;
auto& operator[](size_t i) { return data[i]; }
const auto& operator[](size_t i) const { return data[i]; }
auto begin() const { return data.begin(); }
auto end() const { return data.end(); }
graph() {}
graph(int N) : data(N) {}
bool empty() const { return data.empty(); }
int size() const { return data.size(); }
void add_edge(int i, int j, T w, int index = -1) {
data[i].emplace_back(i, j, w, index);
}
void add_undirected(int i, int j, T w, int index = -1) {
add_edge(i, j, w, index);
add_edge(j, i, w, index);
}
template <size_t I, bool DIRECTED = true, bool WEIGHTED = true>
void read(int M) {
for (int i = 0; i < M; ++i) {
int u, v;
std::cin >> u >> v;
u -= I;
v -= I;
T w = 1;
if (WEIGHTED) std::cin >> w;
if (DIRECTED)
add_edge(u, v, w, i);
else
add_undirected(u, v, w, i);
}
}
};
template <typename T>
using tree = graph<T>;
} // namespace haar_lib
namespace haar_lib {
template <typename T>
void rooting(tree<T> &tr, int cur, int par = -1) {
if (par != -1) {
for (auto it = tr[cur].begin(); it != tr[cur].end(); ++it) {
if (it->to == par) {
tr[cur].erase(it);
break;
}
}
}
for (auto &e : tr[cur]) {
rooting(tr, e.to, cur);
}
}
} // namespace haar_lib
namespace haar_lib {
template <typename F>
struct fix_point : F {
explicit constexpr fix_point(F &&f) noexcept : F(std::forward<F>(f)) {}
template <typename... Args>
constexpr auto operator()(Args &&... args) const {
return F::operator()(*this, std::forward<Args>(args)...);
}
};
template <typename F>
inline constexpr auto make_fix_point(F &&f) {
return fix_point<F>(std::forward<F>(f));
}
template <typename F>
inline constexpr auto make_fix_point(F &f) {
return fix_point<F>(std::forward<F>(f));
}
} // namespace haar_lib
namespace haar_lib {}
namespace solver {
using namespace haar_lib;
constexpr int m1000000007 = 1000000007;
constexpr int m998244353 = 998244353;
void init() {
std::cin.tie(0);
std::ios::sync_with_stdio(false);
std::cout << std::fixed << std::setprecision(12);
std::cerr << std::fixed << std::setprecision(12);
std::cin.exceptions(std::ios_base::failbit);
}
void solve() {
int N, Q; std::cin >> N >> Q;
graph<int> g(N);
g.read<1, false, false>(N - 1);
rooting(g, 0);
auto count = std::vector<int>(N);
fix_point([&](auto &f, int i) -> int {
count[i] = 1;
for (auto &e : g[i]) {
count[i] += f(e.to);
}
return count[i];
})(0);
dump(count);
int64_t ans = 0;
for (int i = 0; i < Q; ++i) {
int64_t p, x; std::cin >> p >> x;
--p;
ans += x * count[p];
std::cout << ans << "\n";
}
}
}
int main() {
solver::init();
while (true) {
try {
solver::solve();
std::cout << std::flush;
std::cerr << std::flush;
} catch (const std::istream::failure &e) {
break;
} catch (...) {
break;
}
}
return 0;
}