結果
問題 | No.1532 Different Products |
ユーザー |
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提出日時 | 2021-06-04 21:18:51 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 2,279 ms / 4,000 ms |
コード長 | 3,118 bytes |
コンパイル時間 | 2,037 ms |
コンパイル使用メモリ | 207,620 KB |
最終ジャッジ日時 | 2025-01-21 23:36:07 |
ジャッジサーバーID (参考情報) |
judge5 / judge3 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 2 |
other | AC * 62 |
ソースコード
#include <bits/stdc++.h>using i32 = std::int32_t;using u32 = std::uint32_t;using i64 = std::int64_t;using u64 = std::uint64_t;using i128 = __int128_t;using u128 = __uint128_t;using isize = std::ptrdiff_t;using usize = std::size_t;class rep {struct Iter {usize itr;constexpr Iter(const usize pos) noexcept : itr(pos) {}constexpr void operator++() noexcept { ++itr; }constexpr bool operator!=(const Iter& other) const noexcept { return itr != other.itr; }constexpr usize operator*() const noexcept { return itr; }};const Iter first, last;public:explicit constexpr rep(const usize first, const usize last) noexcept : first(first), last(std::max(first, last)) {}constexpr Iter begin() const noexcept { return first; }constexpr Iter end() const noexcept { return last; }};template <class F> struct RecursiveLambda : private F {explicit constexpr RecursiveLambda(F&& f) : F(std::forward<F>(f)) {}template <class... Args> constexpr decltype(auto) operator()(Args&&... args) const {return F::operator()(*this, std::forward<Args>(args)...);}};template <class F> constexpr decltype(auto) rec_lambda(F&& f) {using G = std::decay_t<F>;return RecursiveLambda<G>(std::forward<G>(f));}template <class T> using Vec = std::vector<T>;void main_() {usize N;u64 K;std::cin >> N >> K;Vec<std::pair<u64, u64>> dp;dp.emplace_back(1, 1);for (const auto i : rep(1, std::min<usize>(N, 80) + 1)) {const auto cur = dp.size();for (const auto j : rep(0, cur)) {if (dp[j].first * i <= K) {dp.emplace_back(dp[j].first * i, dp[j].second);}}std::inplace_merge(dp.begin(), dp.begin() + cur, dp.end());Vec<std::pair<u64, u64>> next;u64 last = 0;for (const auto [x, c] : dp) {if (x != last) {next.emplace_back(x, 0);last = x;}next.back().second += c;}dp = std::move(next);}const auto size = dp.size();Vec<u64> sum(size + 1);for (const auto i : rep(0, size)) {sum[i + 1] = sum[i] + dp[i].second;}std::array<u64, 1000000> count{};for (const auto i : rep(0, size)) {if (dp[i].first <= 1000000) {count[dp[i].first] += dp[i].second;}}for (const auto i : rep(1, count.size())) {count[i] += count[i - 1];}u64 ans = 0;rec_lambda([&](auto&& dfs, const u64 from, const u64 cur) -> void {if (cur > 10000) {ans += count[K / cur];} else {ans += sum[std::lower_bound(dp.begin(), dp.end(), std::pair<u64, u64>(K / cur + 1, 0)) - dp.begin()];}for (const auto next : rep(from, N + 1)) {if (cur * next > K) break;dfs(next + 1, cur * next);}})(81, 1);std::cout << ans - 1 << '\n';}int main() {std::ios_base::sync_with_stdio(false);std::cin.tie(nullptr);main_();return 0;}