Submission #572604

#TimeUsernameProblemLanguageResultExecution timeMemory
572604JovanBLet's Win the Election (JOI22_ho_t3)C++17
21 / 100
594 ms6336 KiB
#include <bits/stdc++.h> using namespace std; using ll = long long; using ld = long double; const int N = 500; ll dpm[N+5][N+5]; ld dp[N+5][N+5]; pair <int, int> a[N+5]; int main(){ ios_base::sync_with_stdio(false), cin.tie(0); cout.precision(10); cout << fixed; int n, k; cin >> n >> k; for(int i=1; i<=n; i++){ cin >> a[i].first >> a[i].second; if(a[i].second == -1) a[i].second = 1005; } sort(a+1, a+1+n, [](pair <int, int> x, pair <int, int> y){ if(x.second == y.second) return x.first < y.first; return x.second < y.second; }); for(int j=1; j<=n; j++) dpm[n+1][j] = 1e18; for(int i=n; i>=1; i--){ for(int j=1; j<=n; j++){ dpm[i][j] = dpm[i+1][j]; dpm[i][j] = min(dpm[i][j], dpm[i+1][j-1] + a[i].first); } } ld res = 1e18; for(int t=0; t<=k; t++){ for(int j=1; j<=t; j++) dp[0][j] = 1e18; for(int i=1; i<=n; i++){ for(int j=0; j<=t; j++){ dp[i][j] = dp[i-1][j] + 1.0*a[i].first/(t + 1); if(a[i].second != 1005 && j) dp[i][j] = min(dp[i][j], dp[i-1][j-1] + 1.0*a[i].second/j); } } for(int i=1; i<=n; i++){ if(i >= t && k >= i) res = min(res, dp[i][t] + 1.0*dpm[i+1][k-i]/(t + 1)); } } cout << res << "\n"; return 0; }
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