제출 #1186420

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1186420		Zbyszek99	Let's Win the Election (JOI22_ho_t3)	C++20	10 / 100	1094 ms	4448 KiB

Main

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define ll long long
#define ld long double
#define ull unsigned long long
#define ff first
#define ss second
#define pii pair<int,int>
#define pll pair<long long, long long>
#define vi vector<int>
#define vl vector<long long>
#define pb push_back
#define rep(i, b) for(int i = 0; i < (b); ++i)
#define rep2(i,a,b) for(int i = a; i <= (b); ++i)
#define rep3(i,a,b,c) for(int i = a; i <= (b); i+=c)
#define count_bits(x) __builtin_popcountll((x))
#define all(x) (x).begin(),(x).end()
#define siz(x) (int)(x).size()
#define forall(it,x) for(auto& it:(x))
using namespace __gnu_pbds;
using namespace std;
typedef tree<int, null_type, less<int>, rb_tree_tag,tree_order_statistics_node_update> ordered_set;
//mt19937 mt;void random_start(){mt.seed(chrono::time_point_cast<chrono::milliseconds>(chrono::high_resolution_clock::now()).time_since_epoch().count());}
//ll los(ll a, ll b) {return a + (mt() % (b-a+1));}
const int INF = 1e9+50;
const ll INF_L = 1e18+40;
const ll MOD = 1e9+7;

const int maxn = 501;

ld A[501];
ld B[501];
ld dp[maxn+3][maxn+3];

int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    //random_start();
    int n,k;
    cin >> n >> k;
    rep2(j,0,maxn)
    {
        rep2(k,0,maxn)
        {
            dp[j][k] = 1e18;
        }
    }
    dp[0][0] = 0;
    vector<pll> elms;
    rep2(i,1,n)
    {
        cin >> A[i] >> B[i];
        if(B[i] == -1) B[i] = 1e18;
        elms.pb({B[i],A[i]});
    }
    sort(all(elms));
    rep(i,n)
    {
        A[i+1] = elms[i].ss;
        B[i+1] = elms[i].ff;
    }
    ld ans = 1e18;
    rep2(pref,0,n)
    {
        for(int votes = maxn; votes >= 0; votes--)
        {
            for(int col = maxn; col >= 0; col--)
            {
                //none
                if(votes >= k) 
                {
                    ans = min(ans,dp[votes][col]);
                }
                // A
                dp[votes+1][col] = min(dp[votes+1][col],dp[votes][col] + A[pref+1] / (ld)(col+1));
                // B
                dp[votes+1][col+1] = min(dp[votes+1][col+1],dp[votes][col] + B[pref+1] / (ld)(col+1));
                
            }
        }
    }
    cout << fixed << setprecision(6) << ans << "\n";
}

• 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