結果
問題 | No.2358 xy+yz+zx=N |
ユーザー | OnjoujiToki |
提出日時 | 2023-07-08 12:57:06 |
言語 | C++17 (gcc 12.3.0 + boost 1.83.0) |
結果 |
AC
|
実行時間 | 35 ms / 2,000 ms |
コード長 | 6,775 bytes |
コンパイル時間 | 1,670 ms |
コンパイル使用メモリ | 143,472 KB |
実行使用メモリ | 6,944 KB |
最終ジャッジ日時 | 2024-07-22 08:29:19 |
合計ジャッジ時間 | 3,119 ms |
ジャッジサーバーID (参考情報) |
judge3 / judge1 |
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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 | 2 ms
6,816 KB |
testcase_01 | AC | 2 ms
6,944 KB |
testcase_02 | AC | 2 ms
6,944 KB |
testcase_03 | AC | 2 ms
6,944 KB |
testcase_04 | AC | 2 ms
6,940 KB |
testcase_05 | AC | 2 ms
6,944 KB |
testcase_06 | AC | 2 ms
6,944 KB |
testcase_07 | AC | 2 ms
6,944 KB |
testcase_08 | AC | 34 ms
6,944 KB |
testcase_09 | AC | 35 ms
6,944 KB |
testcase_10 | AC | 29 ms
6,940 KB |
testcase_11 | AC | 30 ms
6,940 KB |
testcase_12 | AC | 23 ms
6,940 KB |
ソースコード
#include <algorithm> #include <array> #include <bitset> #include <cassert> #include <chrono> #include <cmath> #include <complex> #include <cstdint> #include <cstring> #include <ctime> #include <deque> #include <iomanip> #include <iostream> #include <map> #include <numeric> #include <queue> #include <random> #include <set> #include <unordered_map> #include <unordered_set> using namespace std; template <int mod> struct ModInt { int x; ModInt() : x(0) {} ModInt(long long y) : x(y >= 0 ? y % mod : (mod - (-y) % mod) % mod) {} ModInt &operator+=(const ModInt &p) { if ((x += p.x) >= mod) x -= mod; return *this; } ModInt &operator-=(const ModInt &p) { if ((x += mod - p.x) >= mod) x -= mod; return *this; } ModInt &operator*=(const ModInt &p) { x = (int)(1LL * x * p.x % mod); return *this; } ModInt &operator/=(const ModInt &p) { *this *= p.inverse(); return *this; } ModInt &operator^=(long long p) { // quick_pow here:3 ModInt res = 1; for (; p; p >>= 1) { if (p & 1) res *= *this; *this *= *this; } return *this = res; } ModInt operator-() const { return ModInt(-x); } ModInt operator+(const ModInt &p) const { return ModInt(*this) += p; } ModInt operator-(const ModInt &p) const { return ModInt(*this) -= p; } ModInt operator*(const ModInt &p) const { return ModInt(*this) *= p; } ModInt operator/(const ModInt &p) const { return ModInt(*this) /= p; } ModInt operator^(long long p) const { return ModInt(*this) ^= p; } bool operator==(const ModInt &p) const { return x == p.x; } bool operator!=(const ModInt &p) const { return x != p.x; } explicit operator int() const { return x; } // added by QCFium ModInt operator=(const int p) { x = p; return ModInt(*this); } // added by QCFium ModInt inverse() const { int a = x, b = mod, u = 1, v = 0, t; while (b > 0) { t = a / b; a -= t * b; std::swap(a, b); u -= t * v; std::swap(u, v); } return ModInt(u); } friend std::ostream &operator<<(std::ostream &os, const ModInt<mod> &p) { return os << p.x; } friend std::istream &operator>>(std::istream &is, ModInt<mod> &a) { long long x; is >> x; a = ModInt<mod>(x); return (is); } }; template <typename T> struct SegmentTree { using Monoid = typename T::Monoid; explicit SegmentTree(int n) : SegmentTree(std::vector<Monoid>(n, T::id())) {} explicit SegmentTree(const std::vector<Monoid> &a) : n(a.size()), sz(1) { while (sz < n) sz <<= 1; data.assign(sz << 1, T::id()); std::copy(a.begin(), a.end(), data.begin() + sz); for (int i = sz - 1; i > 0; --i) { data[i] = T::merge(data[i << 1], data[(i << 1) + 1]); } } void set(int idx, const Monoid val) { idx += sz; data[idx] = val; while (idx >>= 1) data[idx] = T::merge(data[idx << 1], data[(idx << 1) + 1]); } Monoid get(int left, int right) const { Monoid res_l = T::id(), res_r = T::id(); for (left += sz, right += sz; left < right; left >>= 1, right >>= 1) { if (left & 1) res_l = T::merge(res_l, data[left++]); if (right & 1) res_r = T::merge(data[--right], res_r); } return T::merge(res_l, res_r); } Monoid operator[](const int idx) const { return data[idx + sz]; } private: const int n; int sz; // sz + 原数组坐标 = 线段树里的编号,1 based std::vector<Monoid> data; }; namespace monoid { template <typename T> struct RangeMinimumQuery { using Monoid = T; static constexpr Monoid id() { return std::numeric_limits<Monoid>::max(); } static Monoid merge(const Monoid &a, const Monoid &b) { return std::min(a, b); } }; template <typename T> struct RangeMaximumQuery { using Monoid = T; static constexpr Monoid id() { return std::numeric_limits<Monoid>::lowest(); } static Monoid merge(const Monoid &a, const Monoid &b) { return std::max(a, b); } }; template <typename T> struct RangeSumQuery { using Monoid = T; static constexpr Monoid id() { return 0; } static Monoid merge(const Monoid &a, const Monoid &b) { return a + b; } }; } // namespace monoid template <typename T> struct DSU { std::vector<T> f, siz; DSU(int n) : f(n), siz(n, 1) { std::iota(f.begin(), f.end(), 0); } T leader(T x) { while (x != f[x]) x = f[x] = f[f[x]]; return x; } bool same(T x, T y) { return leader(x) == leader(y); } bool merge(T x, T y) { x = leader(x); y = leader(y); if (x == y) return false; siz[x] += siz[y]; f[y] = x; return true; } T size(int x) { return siz[leader(x)]; } }; std::vector<bool> prime_table(int n) { std::vector<bool> prime(n + 1, true); if (n >= 0) prime[0] = false; if (n >= 1) prime[1] = false; for (int i = 2; i * i <= n; i++) { if (!prime[i]) continue; for (int j = i * i; j <= n; j += i) { prime[j] = false; } } return prime; } std::vector<int> enumerate_primes(int n) { if (n <= 1) return {}; auto d = prime_table(n); std::vector<int> primes; primes.reserve(count(begin(d), end(d), true)); for (int i = 0; i < d.size(); i++) { if (d[i]) primes.push_back(i); } return primes; } void solve() { int n; std::cin >> n; std::vector<std::tuple<int, int, int>> ans; // when one is zero // for (int x = 1; x <= sqrt(n); x++) { if (n % x == 0) { ans.emplace_back(0, x, n / x); if (x != n / x) ans.emplace_back(0, n / x, x); ans.emplace_back(n / x, 0, x); if (x != n / x) ans.emplace_back(x, 0, n / x); ans.emplace_back(x, n / x, 0); if (x != n / x) ans.emplace_back(n / x, x, 0); } } // xy + yz + xz = n // n - xy = (x + y)z for (int x = 1; x <= sqrt(n); x++) { for (int y = x; y <= sqrt(n); y++) { if ((n - x * y) % (x + y) == 0) { int z = (n - x * y) / (x + y); if (z < x or z < y) continue; // x <= y <= z ans.emplace_back(x, y, z); if (x == y and x != z) { // x == y < z; ans.emplace_back(x, z, y); ans.emplace_back(z, x, y); } else if (x != y and y == z) { // x < y == z ans.emplace_back(z, x, y); ans.emplace_back(z, y, x); } else if (x == y and y == z) continue; else { assert(x != y and y != z); ans.emplace_back(x, z, y); ans.emplace_back(y, x, z); ans.emplace_back(y, z, x); ans.emplace_back(z, x, y); ans.emplace_back(z, y, x); } } } } std::cout << ans.size() << '\n'; for (auto &[x, y, z] : ans) std::cout << x << ' ' << y << ' ' << z << '\n'; } int main() { std::ios::sync_with_stdio(false); std::cin.tie(nullptr); int t = 1; while (t--) solve(); return 0; }