#include using namespace std; #define incII(i, l, r) for(decay_t i = (l) ; i <= (r); i++) #define incIX(i, l, r) for(decay_t i = (l) ; i < (r); i++) #define incXI(i, l, r) for(decay_t i = (l) + 1; i <= (r); i++) #define incXX(i, l, r) for(decay_t i = (l) + 1; i < (r); i++) #define decII(i, l, r) for(decay_t i = (r) ; i >= (l); i--) #define decIX(i, l, r) for(decay_t i = (r) - 1; i >= (l); i--) #define decXI(i, l, r) for(decay_t i = (r) ; i > (l); i--) #define decXX(i, l, r) for(decay_t i = (r) - 1; i > (l); i--) #define inc(i, n) incIX(i, 0, n) #define dec(i, n) decIX(i, 0, n) #define inc1(i, n) incII(i, 1, n) #define dec1(i, n) decII(i, 1, n) auto inII = [](auto a, auto l, auto r) -> bool { return (l <= a && a <= r); }; auto inIX = [](auto a, auto l, auto r) -> bool { return (l <= a && a < r); }; auto inXI = [](auto a, auto l, auto r) -> bool { return (l < a && a <= r); }; auto inXX = [](auto a, auto l, auto r) -> bool { return (l < a && a < r); }; auto setmin = [](auto & a, auto b) -> bool { return (b < a ? a = b, true : false); }; auto setmax = [](auto & a, auto b) -> bool { return (b > a ? a = b, true : false); }; auto setmineq = [](auto & a, auto b) -> bool { return (b <= a ? a = b, true : false); }; auto setmaxeq = [](auto & a, auto b) -> bool { return (b >= a ? a = b, true : false); }; using LL = long long int; using LD = long double; #define PB push_back #define EB emplace_back #define MP make_pair #define MT make_tuple #define FI first #define SE second #define FR front() #define BA back() #define ALL(a) begin(a), end(a) #define RALL(a) rbegin(a), rend(a) #define RV(a) reverse(ALL(a)) #define ST(a) sort(ALL(a)) #define RST(a) sort(RALL(a)) #define SC static_cast #define SI(a) SC(a.size()) #define SL(a) SC(a.size()) #define RF(e, ...) for(auto && e: __VA_ARGS__) #define SF(a, ...) for(auto && [__VA_ARGS__]: a) #define until(...) while(not(__VA_ARGS__)) #define if_not(...) if(not(__VA_ARGS__)) #define ef else if #define UR assert(false) auto * IS = & cin; auto * OS = & cout; template void in(A & ... a) { (* IS >> ... >> a); } #define IN(...) __VA_ARGS__; in(__VA_ARGS__) struct OS_init { OS_init() { * OS << boolalpha << fixed << setprecision(20); } } os_init_; void out_([[maybe_unused]] string const & s) { } template void out_([[maybe_unused]] string const & s, A const & a) { * OS << a; } template void out_( string const & s, A const & a, B const & ... b) { * OS << a << s; out_(s, b ...); } auto outF = [](string const & s, string const & t, auto const & ... a) { out_(s, a ...); * OS << t << flush; }; auto outN = [](auto const & ... a) { outF("" , "" , a ...); }; auto outS = [](auto const & ... a) { outF(" " , " " , a ...); }; auto outL = [](auto const & ... a) { outF("\n", "\n", a ...); }; auto outSN = [](auto const & ... a) { outF(" " , "" , a ...); }; auto outNL = [](auto const & ... a) { outF("" , "\n", a ...); }; auto outSL = [](auto const & ... a) { outF(" " , "\n", a ...); }; auto out = outSL; template void disp_(A const & a) { * OS << a; } template void disp_(A const & a, string const & s, T const & ... t) { string ss; for(auto && e: a) { * OS << ss; ss = s; disp_(e, t ...); } } auto dispI = [](auto const & a, auto const & s, auto const & ... t) { disp_(a, t ...); * OS << s << flush; }; auto dispT = [](auto const & a, auto const & s, auto const & ... t) { for(auto && e: a) { disp_(e, t ...); * OS << s; } * OS << flush; }; auto dispL = [](auto const & a, auto const & ... t) { dispT(a, "\n", t ...); }; template istream & operator>>(istream & is, vector & v) { for(auto && e: v) { is >> e; } return is; } template ostream & operator<<(ostream & os, vector const & v) { string ss; for(auto && e: v) { os << ss << e; ss = " "; } return os; } template auto make_v(A a) { return a; } template auto make_v(A a, int n, M ... m) { return vector(n, make_v(a, m ...)); } template auto read_v(N ... n) { auto a = make_v(A { }, n ...); in(a); return a; } template istream & operator>>(istream & is, array & a) { for(auto && e: a) { is >> e; } return is; } template ostream & operator<<(ostream & os, array const & a) { string ss; for(auto && e: a) { os << ss << e; ss = " "; } return os; } template istream & operator>>(istream & is, pair & p) { return is >> p.first >> p.second; } template ostream & operator<<(ostream & os, pair const & p) { return os << p.first << " " << p.second; } template void tin_ (istream & is, T & t) { if constexpr(I < tuple_size::value) { is >> get(t); tin_(is, t); } } template void tout_(ostream & os, T const & t) { if constexpr(I < tuple_size::value) { if(I != 0) { os << " "; } os << get(t); tout_(os, t); } } template istream & operator>>(istream & is, tuple & t) { tin_ (is, t); return is; } template ostream & operator<<(ostream & os, tuple const & t) { tout_(os, t); return os; } // ---- ---- class UnionFind { private: int n, s; vector t; vector> v; public: UnionFind(int nn = 0) { init(nn); } void init(int nn) { n = s = nn; t.clear(); v.clear(); inc(i, n) { t.PB(i); v.EB(1, i); } } int get_n() { return n; } int size() { return s; } int id(int x) { return t.at(x); } const vector> & get_v() { return v; } bool unite(int x, int y) { x = id(x); y = id(y); if(x == y) { return false; } if(v[x].size() < v[y].size()) { swap(x, y); } for(auto & e: v[y]) { v[x].PB(e); t[e] = x; } v[y].clear(); s--; return true; } bool same(int x, int y) { return (id(x) == id(y)); } const vector & operator[](int x) { return v[id(x)]; } friend ostream & operator<<(ostream & os, const UnionFind & uf) { inc(i, uf.n) { os << i << ": "; for(auto & e: uf.v[i]) { os << e << " "; } os << "\n"; } return os; } }; // ---- class Point { private: LL x, y; int f() { return ((x > 0 && y == 0) || y > 0 ? 0 : 1); } public: Point(LL xx, LL yy) { assert(! (xx == 0 && yy == 0)); x = xx; y = yy; } static LL cross(Point a, Point b) { return a.x * b.y - a.y * b.x; } friend bool operator==(Point a, Point b) { return (a.f() == b.f() && 0 == cross(a, b)) ; } friend bool operator< (Point a, Point b) { return (a.f() < b.f() || (a.f() == b.f() && 0 < cross(a, b))); } friend bool operator<=(Point a, Point b) { return (a.f() < b.f() || (a.f() == b.f() && 0 <= cross(a, b))); } Point operator-() { return Point(-x, -y); } Point p90() { return Point(-y, +x); } Point m90() { return Point(+y, -x); } LL get_x() { return x; } LL get_y() { return y; } friend ostream & operator<<(ostream & os, Point p) { return (os << p.x << " " << p.y); } }; auto clock_0 = chrono::system_clock::now(); chrono::milliseconds TIME_LIMIT(950); int main() { int IN(n, m); auto p = read_v>(n); auto dist2 = [](auto a, auto b) -> int { auto sq = [](auto x) { return x * x; }; return sq(a.FI - b.FI) + sq(a.SE - b.SE); }; mt19937 e(12345); uniform_int_distribution rand(-500, +500); vector> S; vector> ANS; int SCORE = 1e9; int cnt = 0; while(chrono::system_clock::now() - clock_0 < TIME_LIMIT) { cnt++; vector> s(m); { vector P; inc(i, m) { int x = rand(e); int y = rand(e); if(x == 0 && y == 0) { x = 1; } P.EB(x, y); } ST(P); inc(i, m) { s[i] = { P[i].get_x() + 500, P[i].get_y() + 500 }; } } vector> v(m); int t = -1; inc(i, n) { pair P { 1'000'000, -1 }; inc(j, m) { setmin(P, MP(dist2(p[i], s[j]), j)); } v[P.SE].PB(i); if(i == 0) { t = P.SE; } } UnionFind uf(n + m); vector> ans; inc(i_, m) { int i = (t + i_) % m; vector> E; v[i].PB(n + i); inc(x_, SI(v[i])) { inc(y_, x_) { int a = v[i][x_]; int b = v[i][y_]; if(x_ == SI(v[i]) - 1) { E.PB({ 5 * dist2(s[i], p[b]), a, b }); } else { E.PB({ 25 * dist2(p[a], p[b]), a, b }); } } } ST(E); vector> g(n + m); SF(E, d_, a, b) { SC(d_); if(uf.unite(a, b)) { g[a].PB(b); g[b].PB(a); } } function dfs = [&](int v, int p) { ans.EB(v / n + 1, v % n + 1); RF(w, g[v]) { if(w == p) { continue; } dfs(w, v); ans.EB(v / n + 1, v % n + 1); } }; dfs(v[i][0], -1); ans.EB(2, (i + 1) % m + 1); } ans.EB(1, 1); auto SUM = [&]() -> int { vector> D; inc(i, SI(ans) - 1) { int t = 4 - ans[i].FI - ans[i + 1].FI; int d = dist2( (ans[i ].FI == 1 ? p : s)[ans[i ].SE - 1], (ans[i + 1].FI == 1 ? p : s)[ans[i + 1].SE - 1] ); inc(tt, t) { d *= 5; } D.EB(d, t); } ST(D); // dispL(D); int sum = 0; SF(D, d, t_) { sum += d; SC(t_); } return sum; }; if(setmin(SCORE, SUM())) { S = s; ANS = ans; } } dispL(S); out(SI(ANS)); dispL(ANS); // out("cnt:", cnt); }