結果
問題 | No.94 圏外です。(EASY) |
ユーザー |
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提出日時 | 2014-12-08 23:43:17 |
言語 | C++11 (gcc 13.3.0) |
結果 |
AC
|
実行時間 | 5 ms / 5,000 ms |
コード長 | 3,917 bytes |
コンパイル時間 | 1,373 ms |
コンパイル使用メモリ | 117,180 KB |
実行使用メモリ | 6,944 KB |
最終ジャッジ日時 | 2024-06-26 07:24:51 |
合計ジャッジ時間 | 2,102 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge4 |
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ファイルパターン | 結果 |
---|---|
other | AC * 22 |
ソースコード
#include <iostream>#include <vector>#include <algorithm>#include <string>#include <sstream>#include <cstring>#include <cstdio>#include <cstdlib>#include <cmath>#include <queue>#include <stack>#include <map>#include <set>#include <numeric>#include <cctype>#include <tuple>#include <climits>#include <bitset>#include <cassert>#include <random>#include <complex>#ifdef _MSC_VER#include <agents.h>#endif#define FOR(i, a, b) for(int i = (a); i < (int)(b); ++i)#define rep(i, n) FOR(i, 0, n)#define ALL(v) v.begin(), v.end()#define REV(v) v.rbegin(), v.rend()#define MEMSET(v, s) memset(v, s, sizeof(v))#define UNIQUE(v) (v).erase(unique(ALL(v)), (v).end())#define MP make_pair#define MT make_tupleusing namespace std;typedef long long ll;//typedef pair<int, int> P;const double EPS = 1e-8;const double INF = 1e12;typedef complex<double> P;typedef P point;namespace std {bool operator < (const P& a, const P& b) {return real(a) != real(b) ? real(a) < real(b) : imag(a) < imag(b);}}double cross(const P& a, const P& b) {return imag(conj(a)*b);}double dot(const P& a, const P& b) {return real(conj(a)*b);}struct L : public vector<P> {L(const P &a, const P &b) {push_back(a); push_back(b);}};typedef vector<P> G;struct C {P p; double r;C(const P &p, double r) : p(p), r(r) { }};int ccw(P a, P b, P c) {b -= a; c -= a;if (cross(b, c) > 0) return +1; // counter clockwiseif (cross(b, c) < 0) return -1; // clockwiseif (dot(b, c) < 0) return +2; // c--a--b on lineif (norm(b) < norm(c)) return -2; // a--b--c on linereturn 0;}vector<point> convex_hull(vector<point> &ps) {int n = ps.size(), k = 0;sort(ps.begin(), ps.end());vector<point> ch(2 * n);for (int i = 0; i < n; ch[k++] = ps[i++]) // lower-hullwhile (k >= 2 && ccw(ch[k - 2], ch[k - 1], ps[i]) <= 0) --k;for (int i = n - 2, t = k + 1; i >= 0; ch[k++] = ps[i--]) // upper-hullwhile (k >= t && ccw(ch[k - 2], ch[k - 1], ps[i]) <= 0) --k;ch.resize(k - 1);return ch;}typedef double number;typedef vector<P> polygon;#define curr(P, i) P[i]#define next(P, i) P[(i+1)%P.size()]#define diff(P, i) (next(P, i) - curr(P, i))number convex_diameter(const polygon &pt) {double d = 0;for (auto p1 : pt) for (auto p2 : pt) d = max(d, norm(p1 - p2));return d;}const int N = 120010;struct UnionFind{int par[N];UnionFind(int n){iota(par, par + n, 0);}int find(int x){if (par[x] == x) return x;return par[x] = find(par[x]);}void unite(int x, int y){par[find(x)] = find(y);}};const int X = 10020;map<int, int> yy[20050];int main(){cin.tie(0);ios::sync_with_stdio(false);int n;cin >> n;vector<P> vp;rep(i, n){int x, y;cin >> x >> y;vp.emplace_back(P(x, y));yy[X + x][y] = i;}UnionFind uf(n);rep(i, n){int x = X + vp[i].real();int y = vp[i].imag();for (int dx = -10; dx <= 10; ++dx){int dy = sqrt(100 - dx*dx);if (yy[x + dx].empty()) continue;auto it1 = yy[x + dx].lower_bound(y - dy);auto it2 = yy[x + dx].upper_bound(y + dy);while (it1 != it2){uf.unite(i, it1->second);++it1;}}}vector<int> num(n);rep(i, n) num[i] = uf.find(i);sort(ALL(num));UNIQUE(num);auto get = [&](int x){return lower_bound(ALL(num), x) - num.begin(); };vector<vector<P>> gr(num.size());rep(i, n) gr[get(uf.find(i))].push_back(vp[i]);double ans = 0;for (auto &poly : gr){if (poly.size() <= 2){if(poly.size() != 1) ans = max(ans, abs(poly[0] - poly[1]));}else{ans = max(ans, sqrt(convex_diameter(convex_hull(poly))));}}cout.setf(ios::fixed);cout.precision(12);cout << ans + 1 + (n!=0) << endl;return 0;}