제출 #1293202

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1293202		Triseedot	Let's Win the Election (JOI22_ho_t3)	C++20	10 / 100	1 ms	352 KiB

Main

// Made by ordinary newbie

#pragma region setup
#include <bits/stdc++.h>
#include <random>
#include <chrono>
using namespace std;

// variables
#define int long long
using ld = long double;
using ll = long long;
using ull = unsigned long long;
template<typename T>
using min_heap = priority_queue<T, vector<T>, greater<T>>;
// bitwise operations
#define cnt_bit(n) __builtin_popcountll(n)
#define low_bit(n) ((n) & (-(n)))
#define bit(n, i) (((n) >> (i)) & 1)
#define set_bit(n, i) ((n) | (1ll << (i)))
#define reset_bit(n, i) ((n) & ~(1ll << (i)))
#define flip_bit(n, i) ((n) ^ (1ll << (i)))
// math
#define sqr(n) ((n) * (n))
int log2_floor(ull n) {
    return n ? __builtin_clzll(1) - __builtin_clzll(n) : -1;
}
const ll INF = 1e18;
// utils
#define len(x) (int) x.size()
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
template <typename T>
istream& operator>>(istream& is, vector<T>& v) {
    for(auto& el : v) {
        is >> el;
    }
    return is;
}
template <typename T>
ostream& operator<<(ostream& os, const vector<T>& v) {
    for (int i = 0; i < len(v); i++) {
        if (i) os << ' ';
        os << v[i];
    }
    return os;
}
template<class... Args>
auto create(size_t n, Args&&... args) {
    if constexpr(sizeof...(args) == 1) {
        return vector(n, args...);
    }
    else {
        return vector(n, create(args...));
    }
}
struct custom_hash {
    static uint64_t splitmix64(uint64_t x) {
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }

    size_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
    size_t operator()(pair<int, int> x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x.first + FIXED_RANDOM) ^ splitmix64(x.second + FIXED_RANDOM);
    }
};
template<typename T, typename U>
bool chmin(T& a, const U b) {
    if (b < a) {
        a = b;
        return true;
    }
    return false;
}
template<typename T, typename U>
bool chmax(T& a, const U b) {
    if (b > a) {
        a = b;
        return true;
    }
    return false;
}
template<typename T>
void compress(vector<T>& v) {
    int n = len(v);
    vector<pair<T, int>> u(n);
    for (int i = 0; i < n; i++) {
        u[i] = {v[i], i};
    }
    sort(all(u));
    int curr = 0;
    for (int i = 0; i < n; i++) {
        if (i != 0 && u[i].first != u[i - 1].first) curr++;
        v[u[i].second] = curr;
    }
}
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
#pragma endregion

struct city {
    int a, b, i;
};

void solve() {
    int n, k;
    cin >> n >> k;
    vector<city> c(n);
    for (int i = 0; i < n; i++) {
        cin >> c[i].a >> c[i].b;
        if (c[i].b == -1) c[i].b = INF;
        c[i].i = i;
    }
    sort(all(c), [] (city a, city b) { return a.b < b.b; });
    vector c1 = c;
    sort(all(c1), [] (city a, city b) { return a.a < b.a; });

    ld ans = INF;
    for (int cnt = 0; cnt < k; cnt++) {
        if (cnt > 0 && c[cnt - 1].b == INF) {
            break;
        }
        vector<bool> used(n, false);
        ld ans1 = 0;
        for (int j = 0; j < cnt; j++) {
            used[c[j].i] = true;
            ans1 += ld(c[j].b) / (j + 1);
        }
        int curr = cnt;
        for (int j = 0; j < n && curr < k; j++) {
            if (used[c1[j].i]) continue;
            curr++;
            ans1 += ld(c1[j].a) / (cnt + 1);
        }
        chmin(ans, ans1);
    }
    cout << fixed << setprecision(10) << ans << '\n';
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    int tt = 1;
    //cin >> tt;
    for (int i = 1; i <= tt; i++) {
        solve();
    }
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 0 / 11
• Subtask 4: 0 / 12
• Subtask 5: 0 / 33
• Subtask 6: 0 / 11
• Subtask 7: 0 / 23