제출 #482696

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
482696		jalsol	Odašiljači (COCI20_odasiljaci)	C++17	70 / 70	83 ms	15972 KiB

odasiljaci

#ifdef LOCAL
#include "local.h"
#else
#include <bits/stdc++.h>
#define debug(...)
#define DB(...)
#endif

using namespace std;

const bool __initialization = []() {
    cin.tie(nullptr)->sync_with_stdio(false);
#define TASK "ANGTEN"
    if (fopen(TASK".inp", "r")) {
        (void)(!freopen(TASK".inp", "r", stdin));
        (void)(!freopen(TASK".out", "w", stdout)); }
    cout << setprecision(12) << fixed;
    return true;
}();

using ll = long long;
using ld = long double;

#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()

#define For(i, l, r) for (int i = (l); i <= (r); ++i)
#define Ford(i, r, l) for (int i = (r); i >= (l); --i)
#define Rep(i, n) For (i, 0, (n) - 1)
#define Repd(i, n) Ford (i, (n) - 1, 0)
#define Fe(...) for (auto __VA_ARGS__)

template <class C> inline int isz(const C& c) { return static_cast<int>(c.size()); }
template <class T> inline bool chmin(T& a, const T& b) { return (a > b) ? a = b, true : false; }
template <class T> inline bool chmax(T& a, const T& b) { return (a < b) ? a = b, true : false; }

constexpr ld eps = 1e-9;
constexpr int inf = 1e9;
constexpr ll linf = 1e18;

// =============================================================================

constexpr int maxn = 1000 + 5;

struct Pt { int x, y; };
struct Edge {
    int u, v; ld c;

    bool operator<(const Edge& o) const {
        return c < o.c;
    }
};

int n;
Pt a[maxn];
Edge e[maxn * maxn];
int ptr;
int par[maxn];

int find(int x) {
    return (par[x] < 0) ? x : (par[x] = find(par[x]));
}

bool merge(int u, int v) {
    u = find(u); v = find(v);
    if (u == v) return false;

    if (par[v] < par[u]) swap(u, v);
    par[u] += par[v];
    par[v] = u;
    return true;
}

ll sqr(ll x) {
    return x * x;
}

ld calc(int i, int j) {
    return sqrt(sqr(a[i].x - a[j].x) + sqr(a[i].y - a[j].y));
}

signed main() {
    cin >> n;
    For (i, 1, n) cin >> a[i].x >> a[i].y;

    For (i, 1, n - 1) {
        For (j, i + 1, n ) {
            e[ptr++] = {i, j, calc(i, j)};
        }
    }

    sort(e, e + ptr);
    memset(par + 1, -1, sizeof(int) * n);
    ld ans = 0;

    Rep (i, ptr) {
        if (merge(e[i].u, e[i].v)) {
            ans = e[i].c;
        }
    }

    cout << ans / 2 << '\n';
}

• Subtask 1: 70 / 70