Submission #1194452

#	Time	Username	Problem	Language	Result	Execution time	Memory
1194452		biank	Let's Win the Election (JOI22_ho_t3)	C++20	56 / 100	2594 ms	3056 KiB

Main

#include <bits/stdc++.h>

using namespace std;

#define forn(i,n) for(int i=0;i<int(n);i++)
#define forsn(i,s,n) for(int i=int(s);i<int(n);i++)
#define dforn(i,n) for(int i=int(n)-1;i>=0;i--)
#define dforsn(i,s,n) for(int i=int(n)-1;i>=int(s);i--)
#define fst first
#define snd second
#define pb push_back
#define eb emplace_back
#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()

typedef long long ll;
typedef long double ld;
typedef vector<ll> vll;
typedef vector<int> vi;
typedef pair<int,int> ii;

const ld INF = 1e18;
const int N = 500;

void chmin(ld &x, ld v) {
    if (x > v) x = v;
}

ld dp[N][N];

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    
    int n, k;
    cin >> n >> k;
    vector<pair<ll, ll>> x(n);
    forn(i, n){
        cin >> x[i].snd >> x[i].fst;
        if (x[i].fst == -1) x[i].fst = 1e9;
    }
    sort(all(x));
    ld ans = INF;
    forn(c, k + 1) {
        forn(a, k + 1 - c) forn(b, c + 1) dp[a][b] = INF;
        dp[0][0] = 0;
        forn(i, n) dforn(a, k + 1 - c) dforn(b, c + 1) {
            chmin(dp[a + 1][b], dp[a][b] + ld(x[i].snd) / (c + 1));
            chmin(dp[a][b + 1], dp[a][b] + ld(x[i].fst) / (b + 1));
        }
        chmin(ans, dp[k - c][c]);
    }
    cout << fixed << setprecision(10) << ans << '\n';
    
    return 0;
}

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