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77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
#define _CRT_SECURE_NO_WARNINGS
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#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
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#include <bits/stdc++.h>
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using namespace std;
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#define CRP(t, x) const t &x
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#define OPX(op, t, x) operator op(CRP(t, x))
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#define OPL(t, x) bool OPX(<, t, x) const
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#define FIL(x, v) memset(x, v, sizeof(x))
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#define CLR(x) FIL(x, 0)
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#define NE1(x) FIL(x, -1)
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#define INF(x) FIL(x, 0x3f)
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#ifndef _DEBUG
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#define _DEBUG 0
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#endif // !_DEBUG
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#define IFD if (_DEBUG)
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typedef int64_t ll, i64;
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typedef uint64_t ull, u64;
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template <typename T>
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using enable_if_arithmetic = typename enable_if<is_arithmetic<T>::value>::type;
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template <typename T>
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using enable_if_integral = typename enable_if<is_integral<T>::value>::type;
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inline char getchar(int)
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{
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static char buf[64 << 20], *S = buf, *T = buf;
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if (S == T) T = fread(S = buf, 1, 64 << 20, stdin) + buf;
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return S == T ? EOF : *S++;
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}
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template <typename T, typename = enable_if_integral<T>>
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inline bool read(T &x)
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{
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int ch = x = 0, f = 1;
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while (!isdigit(ch = getchar()))
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if (ch == EOF)
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return false;
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else if (ch == '-')
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f = 0;
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for (; isdigit(ch); ch = getchar()) x = x * 10 + ch - '0';
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return x = f ? x : -x, true;
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}
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template <typename T, typename... Args, typename = enable_if_integral<T>>
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inline bool read(T &x, Args &... args) { return read(x) && read(args...); }
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ll gcd(ll a, ll b) { return b == 0 ? a : gcd(b, a % b); }
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ll fpow(ll a, ll b, ll m)
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{
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ll r = 1;
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for (; b; b >>= 1, a = a * a % m)
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if (b & 1) r = r * a % m;
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return r;
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}
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constexpr double eps = 1e-8;
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inline int sgn(double x) { return x > eps ? 1 : x < -eps ? -1 : 0; }
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struct P
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{
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ll x, y, z;
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bool vis;
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ll dis(CRP(P, rhs)) const { return (x - rhs.x) * (x - rhs.x) + (y - rhs.y) * (y - rhs.y) + (z - rhs.z) * (z - rhs.z); }
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} ps[2050];
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int main()
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{
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int n;
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read(n);
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for (int i = 1; i <= n; i++) read(ps[i].x, ps[i].y, ps[i].z);
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for (;;)
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{
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int fst = 0;
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for (int i = 1; i <= n && !fst; i++)
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if (!ps[i].vis) fst = i;
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if (!fst) break;
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int sec = fst + 1;
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while (ps[sec].vis) sec++;
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for (int i = sec + 1; i <= n; i++)
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if (!ps[i].vis && ps[fst].dis(ps[sec]) > ps[fst].dis(ps[i])) sec = i;
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printf("%d %d\n", fst, sec);
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ps[fst].vis = ps[sec].vis = true;
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}
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return 0;
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} |