Submission #674414

#	Time	Username	Problem	Language	Result	Execution time	Memory
674414		abysmal	Let's Win the Election (JOI22_ho_t3)	C++14	10 / 100	2 ms	340 KiB

Main

#include<iostream>
#include<stdio.h>
#include<stdint.h>
#include<vector>
#include<algorithm>
#include<utility>
#include<set>
#include<map>
#include<queue>
#include<stack>
#include<iomanip>
#include<string>

using namespace std;

const int64_t INF = (int64_t) 1e18;
const int64_t mINF = (int64_t) 1e9 + 7;
const int64_t MOD = 998244353;
const int nbit = 11;
const int ndig = 10;
const int nchar = 26;
const int p1 = 31;
const int p2 = 53;
const int D = 4;
int dr[D] = {0, 1, 0, -1};
int dc[D] = {1, 0, -1, 0};
// 0 right // 1 down // 2 left // 3 up

struct Thing
{
    int a;
    int b;

    Thing(int a_, int b_) : a(a_), b(b_) {}

    bool operator < (const Thing& o) const
    {
        if(a != o.a) return a < o.a;
        return b < o.b;
    }
};

struct Solution
{
    int n;
    int k;
    map<Thing, int> a;
    map<Thing, int> b;
    Solution() {}

    void solve()
    {
        cin >> n >> k;

        for(int i = 0; i < n; i++)
        {
            int x;
            int y;
            cin >> x >> y;

            a[Thing(x, y)]++;
            if(y != -1) b[Thing(y, x)]++;
        }

        double ans = mINF;
        double sum = 0;
        for(int i = 1; i <= k; i++)
        {
            double x = 0;
            int cnt = k - i + 1;
            for(map<Thing, int>::iterator it = a.begin(); it != a.end(); it++)
            {
                if(cnt == 0) break;
                Thing t = it->first;
                int c = it->second;

                for(int j = 0; j < c; j++)
                {
                    if(cnt == 0) break;

                    x += ((double) t.a) / ((double) i);
                    cnt--;
                }
            }

            ans = min(ans, sum + x);

            if(b.empty()) break;
            Thing tmp = b.begin()->first;
            Thing r = Thing(tmp.b, tmp.a);

            a[r]--;
            b[tmp]--;
            if(b[tmp] == 0) b.erase(tmp);
            if(a[r] == 0) a.erase(r);
            sum += ((double) tmp.a) / ((double) i);
        }

        cout << setprecision(9) << ans << "\n";
    }

    int modsub(int t1, int t2)
    {
        int res = t1 - t2;
        if(res < 0) res += MOD;

        return res;
    }

    int modadd(int t1, int t2)
    {
        int res = t1 + t2;
        if(res >= MOD) res -= MOD;

        return res;
    }

    int modmul(int t1, int t2)
    {
        int64_t res = 1LL * t1 * t2;
        return (res % MOD);
    }

    bool BIT(int& mask, int& j)
    {
        return (mask & MASK(j));
    }

    int MASK(int j)
    {
        return (1 << j);
    }
};

void __startup()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL); cout.tie(NULL);

//    freopen("in.txt", "r", stdin);
//    freopen("out.txt", "w", stdout);
}

int main()
{
    __startup();
    int t = 1;
//    cin >> t;

    for(int i = 1; i <= t; i++)
    {
        Solution().solve();
    }

    return 0;
}

• 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