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View the Project on GitHub Luzhiled/comp-geometry
// verification-helper: PROBLEM https://onlinejudge.u-aizu.ac.jp/problems/1175 #include "src/real-geometry/class/circle.hpp" #include "src/real-geometry/position/intersect-cc.hpp" #include <iostream> #include <vector> #include <algorithm> using CI = std::pair< geometry::circle<geometry::f80>, int >; std::vector< int > dp; std::vector< int > mask; void precalc(const std::vector< CI > &cs) { int n = cs.size(); for (int i = 0; i < n; i++) { for (int j = 0; j < i; j++) { if (geometry::intersect_cc(cs[i].first, cs[j].first) >= 3) continue; mask[i] |= (1 << j); } } } bool can_remove(int idx, int bit) { return (mask[idx] & bit) == mask[idx]; } int calc(int bit, int cnt, const std::vector< CI > &cs) { if (dp[bit] != -1) return dp[bit]; int n = cs.size(); int &res = dp[bit]; res = cnt; for (int i = 0; i < n; i++) { if (bit & (1 << i)) continue; if (can_remove(i, bit) == false) continue; for (int j = i + 1; j < n; j++) { if (bit & (1 << j)) continue; if (cs[i].second != cs[j].second) continue; if (can_remove(j, bit) == false) continue; res = std::max(res, calc(bit | (1 << i) | (1 << j), cnt + 2, cs)); } } return res; } void solve(int n) { std::vector< CI > cs; dp = std::vector< int >(1 << n, -1); mask = std::vector< int >(n); for (int i = 0; i < n; i++) { geometry::circle<geometry::f80> cir; int c; std::cin >> cir.o >> cir.r >> c; cs.emplace_back(cir, c); } precalc(cs); std::cout << calc(0, 0, cs) << std::endl; } int main() { int n; while (std::cin >> n, n) { solve(n); } }
#line 1 "test/aoj/icpc/1175.test.cpp" // verification-helper: PROBLEM https://onlinejudge.u-aizu.ac.jp/problems/1175 #line 2 "src/real-geometry/class/circle.hpp" #line 2 "src/real-geometry/class/point.hpp" #line 2 "src/real-geometry/class/vector.hpp" #include <complex> #include <iostream> namespace geometry { template< typename R > class vec2d : public std::complex< R > { using complex = std::complex< R >; public: using complex::complex; vec2d(const complex &c): complex::complex(c) {} const R x() const { return this->real(); } const R y() const { return this->imag(); } friend vec2d operator*(const vec2d &v, const R &k) { return vec2d(v.x() * k, v.y() * k); } friend vec2d operator*(const R &k, const vec2d &v) { return vec2d(v.x() * k, v.y() * k); } friend std::istream &operator>>(std::istream &is, vec2d &v) { R x, y; is >> x >> y; v = vec2d(x, y); return is; } }; } #line 4 "src/real-geometry/class/point.hpp" #include <vector> namespace geometry { template< typename R > using point = vec2d<R>; template< typename R > using points = std::vector< point< R > >; } #line 4 "src/real-geometry/class/circle.hpp" #line 6 "src/real-geometry/class/circle.hpp" // circle namespace geometry { template< typename R > class circle { public: point<R> o; R r; circle() = default; circle(point<R> o, R r) : o(o), r(r) {} const point<R> center() const { return o; } const R radius() const { return r; } }; template< typename R > using circles = std::vector< circle<R> >; } #line 2 "src/real-geometry/position/intersect-cc.hpp" #line 2 "src/real-geometry/utility/equals/real-number.hpp" #line 2 "src/real-geometry/utility/sign.hpp" #line 2 "src/real-geometry/common/const/eps.hpp" #line 2 "src/real-geometry/common/float-alias.hpp" namespace geometry { using f80 = long double; using f64 = double; } #line 4 "src/real-geometry/common/const/eps.hpp" namespace geometry { inline static f80 &eps() { static f80 EPS = 1e-10; return EPS; } void set_eps(f80 EPS) { eps() = EPS; } } #line 2 "src/real-geometry/numbers/sign.hpp" #line 2 "src/real-geometry/common/int-alias.hpp" namespace geometry { using i32 = int; using i64 = long long; } #line 4 "src/real-geometry/numbers/sign.hpp" namespace geometry::number::sign { constexpr i32 PLUS = +1; constexpr i32 ZERO = 0; constexpr i32 MINUS = -1; } #line 5 "src/real-geometry/utility/sign.hpp" namespace geometry { using namespace geometry::number::sign; template< typename R > inline int sign(R r) { if (r < -eps()) return MINUS; if (r > +eps()) return PLUS; return ZERO; } } #line 4 "src/real-geometry/utility/equals/real-number.hpp" namespace geometry { template< typename R > bool equals(R a, R b) { return sign(a - b) == 0; } } #line 6 "src/real-geometry/position/intersect-cc.hpp" #include <algorithm> #line 9 "src/real-geometry/position/intersect-cc.hpp" namespace geometry { constexpr int SEPERATE = 4; constexpr int CIRCUMSCRIBE = 3; constexpr int INTERSECT = 2; constexpr int INSCRIBE = 1; constexpr int CONTAIN = 0; template< typename R > int intersect_cc(circle<R> c1, circle<R> c2) { if (c1.r > c2.r) std::swap(c1, c2); R d = std::abs(c1.o - c2.o), r = c1.r + c2.r; if (sign(d - r) > 0) return SEPERATE; if (sign(d + c1.r - c2.r) < 0) return CONTAIN; if (equals(d, r)) return CIRCUMSCRIBE; if (equals(d + c1.r, c2.r)) return INSCRIBE; return INTERSECT; } } #line 5 "test/aoj/icpc/1175.test.cpp" #line 9 "test/aoj/icpc/1175.test.cpp" using CI = std::pair< geometry::circle<geometry::f80>, int >; std::vector< int > dp; std::vector< int > mask; void precalc(const std::vector< CI > &cs) { int n = cs.size(); for (int i = 0; i < n; i++) { for (int j = 0; j < i; j++) { if (geometry::intersect_cc(cs[i].first, cs[j].first) >= 3) continue; mask[i] |= (1 << j); } } } bool can_remove(int idx, int bit) { return (mask[idx] & bit) == mask[idx]; } int calc(int bit, int cnt, const std::vector< CI > &cs) { if (dp[bit] != -1) return dp[bit]; int n = cs.size(); int &res = dp[bit]; res = cnt; for (int i = 0; i < n; i++) { if (bit & (1 << i)) continue; if (can_remove(i, bit) == false) continue; for (int j = i + 1; j < n; j++) { if (bit & (1 << j)) continue; if (cs[i].second != cs[j].second) continue; if (can_remove(j, bit) == false) continue; res = std::max(res, calc(bit | (1 << i) | (1 << j), cnt + 2, cs)); } } return res; } void solve(int n) { std::vector< CI > cs; dp = std::vector< int >(1 << n, -1); mask = std::vector< int >(n); for (int i = 0; i < n; i++) { geometry::circle<geometry::f80> cir; int c; std::cin >> cir.o >> cir.r >> c; cs.emplace_back(cir, c); } precalc(cs); std::cout << calc(0, 0, cs) << std::endl; } int main() { int n; while (std::cin >> n, n) { solve(n); } }