結果
問題 |
No.2769 Number of Rhombi
|
ユーザー |
![]() |
提出日時 | 2024-05-31 23:16:34 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
WA
|
実行時間 | - |
コード長 | 2,184 bytes |
コンパイル時間 | 2,452 ms |
コンパイル使用メモリ | 211,996 KB |
最終ジャッジ日時 | 2025-02-21 18:33:41 |
ジャッジサーバーID (参考情報) |
judge4 / judge4 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 6 WA * 26 |
ソースコード
// (◕ᴗ◕✿) #include <bits/stdc++.h> #pragma GCC target("avx2") #pragma GCC optimize("O3") #pragma GCC optimize("unroll-loops") #define rep(i, n) for (ll i = 0; i < (n); i++) #define srep(i, s, n) for (ll i = s; i < (n); i++) #define len(x) ((int)(x).size()) #define all(x) (x).begin(), (x).end() using namespace std; template<typename T> using vc = vector<T>; template<typename T> using vv = vc<vc<T>>; template<typename T> using vvv = vv<vc<T>>; using vi = vc<int>;using vvi = vv<int>; using vvvi = vv<vi>; using ll = long long;using vl = vc<ll>;using vvl = vv<ll>; using vvvl = vv<vl>; using ld = long double; using vld = vc<ld>; using vvld = vc<vld>; using vvvld = vc<vvld>; using uint = unsigned int; using ull = unsigned long long; const ld pi = acos(-1.0); const int inf = 0x3f3f3f3f; const ll INF = 0x3f3f3f3f3f3f3f3f; // const ll mod = 1000000007; const ll mod = 998244353; inline bool inside(ll y, ll x, ll H, ll W) {return 0 <= (y) and (y) < (H) and 0 <= (x) and (x) < (W); } #define debug(var) do{std::cout << #var << " : \n";view(var);}while(0) template<typename T> void view(T e){cout << e << endl;} template<typename T> void view(const vc<T>& v){for(const auto& e : v){ cout << e << " "; } cout << endl;} template<typename T> void view(const vv<T>& vv){ for(const auto& v : vv){ view(v); } } int main(){ int N; cin >> N; vl X(N), Y(N); rep(i, N) cin >> X[i] >> Y[i]; rep(i, N){ X[i] *= 2; Y[i] *= 2; } map<tuple<ll, ll, ll, ll>, ll> cnt; rep(j, N) rep(i, j){ ll mx = (X[i] + X[j]) / 2, my = (Y[i] + Y[j]) / 2; ll p = (Y[i] - Y[j]), q = (X[i] - X[j]); if (q < 0){ q = -q; p = -p; } ll g = gcd(p, q); p /= g; q /= g; if (!cnt.count({mx, my, p, q})) cnt[{mx, my, p, q}] = 0; cnt[{mx, my, p, q}]++; } ll ans = 0; for (auto [ele, c] : cnt){ auto [mx, my, p, q] = ele; ll np = -q, nq = p; if (nq < 0){ nq = -nq; np = -np; } if (cnt.count({mx, my, np, nq})) ans += c * cnt[{mx, my, np, nq}]; } ans /= 2; cout << ans << endl; }