Submission #938006

#TimeUsernameProblemLanguageResultExecution timeMemory
938006vjudge1Let's Win the Election (JOI22_ho_t3)C++17
21 / 100
992 ms752 KiB
#include <bits/stdc++.h> using namespace std; typedef long double ld; int main(){ ios_base::sync_with_stdio(0); cin.tie(0); int N, K; cin >> N >> K; vector<pair<ld, ld>> v(N); bool special = true; for(int i = 0; i < N; i++){ cin >> v[i].second >> v[i].first; if(v[i].first == -1) v[i].first = 1e9; else if(v[i].first != v[i].second) special = false; } sort(v.begin(), v.end()); ld ans = 7e18; if(special){ for(int collaborators = 0; collaborators < K; collaborators++){ ld cost = 0; ld hv = 1; for(int i = 0; i < collaborators; i++){ cost += v[i].first / hv; hv++; } vector<ld> a; for(int i = collaborators; i < N; i++){ a.push_back(v[i].second); } sort(a.begin(), a.end()); for(int i = 0; i < K - collaborators; i++){ cost += a[i] / hv; } ans = min(ans, cost); } }else if(K == N){ for(ld collaborators = 0; collaborators < K; collaborators++){ vector<ld> dp(collaborators + 1, 1e18); dp[0] = 0; for(int i = 0; i < N; i++){ for(ld j = collaborators; j >= 0; j--){ if(j != collaborators) dp[j+1] = min(dp[j+1], dp[j] + v[i].first / (j+1.0)); dp[j] += v[i].second / (collaborators+1.0); } } ans = min(ans, dp[collaborators]); } }/*else{ assert(false); for(ld collaborators = 0; collaborators < K; collaborators++){ vector<vector<ld>> dp(K+1, vector<ld>(collaborators + 1, 1e18)); dp[0][0] = 0; for(int i = 0; i < N; i++){ for(int elem = K - 1; elem >= 0; elem--){ for(ld j = collaborators; j >= 0; j--){ if(j != collaborators) dp[elem+1][j+1] = min(dp[elem+1][j+1], dp[elem][j] + v[i].first / (j+1.0)); dp[elem+1][j] = min(dp[elem+1][j], dp[elem][j] + v[i].second / (collaborators+1.0)); } } } ans = min(ans, dp[K][collaborators]); } }*/ cout << fixed << setprecision(8) << ans << "\n"; }
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