結果
問題 | No.1265 Balloon Survival |
ユーザー |
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提出日時 | 2020-10-24 00:03:03 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 70 ms / 2,000 ms |
コード長 | 2,668 bytes |
コンパイル時間 | 2,488 ms |
コンパイル使用メモリ | 208,728 KB |
最終ジャッジ日時 | 2025-01-15 14:30:54 |
ジャッジサーバーID (参考情報) |
judge3 / judge1 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 4 |
other | AC * 32 |
ソースコード
#ifdef LOCAL#define _GLIBCXX_DEBUG#endif#include<bits/stdc++.h>using namespace std;#define rep(i,s,t) for(ll i = (ll)(s); i < (ll)(t); i++)#define rrep(i,s,t) for(ll i = (ll)(s-1);(ll)(t) <= i; i--)#define all(x) (x).begin(), (x).end()typedef long long ll;typedef long double ld;typedef pair<ll,ll> Pll;typedef vector<ll> vl;typedef vector<vl> vvl;typedef vector<vvl> vvvl;constexpr ll INF = numeric_limits<ll>::max()/4;constexpr ll n_max = 2e5+10;#define int llconst long double pi = 3.14159265358979323846;template <typename A, typename B>string to_string(pair<A, B> p);string to_string(const string &s) {return '"' + s + '"';}string to_string(const char *c) {return to_string((string) c);}string to_string(bool b) {return (b ? "true" : "false");}template <size_t N>string to_string(bitset<N> v){string res = "";for(size_t i = 0; i < N; i++) res += static_cast<char>('0' + v[i]);return res;}template <typename A>string to_string(A v) {bool first = true;string res = "{";for(const auto &x : v) {if(!first) res += ", ";first = false;res += to_string(x);}res += "}";return res;}template <typename A, typename B>string to_string(pair<A, B> p){return "(" + to_string(p.first) + ", " + to_string(p.second) + ")";}void debug_out() {cerr << endl;}template<typename Head, typename... Tail>void debug_out(Head H, Tail... T) {cerr << " " << to_string(H);debug_out(T...);}#ifdef LOCAL#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)#else#define debug(...) 42#endiftemplate<class T>bool chmax(T &a, T b){if(a < b){a = b; return true;} return false;}template<class T>bool chmin(T &a, T b){if(a > b){a = b; return true;} return false;}signed main(){cin.tie(nullptr);ios::sync_with_stdio(false);ll n; cin >> n;vector<Pll> p(n);rep(i,0,n){cin >> p[i].first >> p[i].second;}vector<tuple<ll, ll, ll>> v;auto calc = [&](ll i, ll j) {ll x = (p[i].first - p[j].first);ll y = p[i].second - p[j].second;return x * x + y * y;};rep(i, 0, n) rep(j, i + 1, n) {ll dist = calc(i, j);v.emplace_back(make_tuple(dist, i, j));}sort(all(v));vector<ll> used(n);ll ans = 0;ll m = v.size();rep(i,0,m){auto [d, f, t] = v[i];if(f == 0){if(!used[t]){ans++;used[t] = 1;}}else{if (used[f] || used[t]) continue;used[f] = 1;used[t] = 1;}}cout << ans << "\n";}