제출 #1196125

#제출 시각아이디문제언어결과실행 시간메모리
1196125JuanJLLet's Win the Election (JOI22_ho_t3)C++20
67 / 100
2603 ms255160 KiB
#include <bits/stdc++.h> #include <ext/pb_ds/assoc_container.hpp> #include <ext/pb_ds/tree_policy.hpp> #define fst first #define snd second #define pb push_back #define forn(i,a,b) for(int i = a; i < b; i++) #define ALL(x) x.begin(),x.end() #define SZ(x) (int)x.size() #define mset(a,v) memset((a),(v),sizeof(a)) #define FIN ios::sync_with_stdio(0); cin.tie(0); cout.tie(0); #define dbg(v) cout<<"Line("<<__LINE__<<"): "<<#v<<" = "<<v<<'\n'; #define pi pair<int,int> #define pll pair<ll,ll> typedef int ll; using namespace std; using namespace __gnu_pbds; typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> indexed_set; typedef tree<int,null_type,less_equal<int>,rb_tree_tag,tree_order_statistics_node_update> indexed_multiset; const int MAXN = 502; double dp[MAXN][MAXN][MAXN]; bool vis[MAXN][MAXN][MAXN]; ll n,k,c; vector<pair<double,double>> s; double f(ll x, ll y, ll z){ double &res = dp[x][y][z]; if(vis[x][y][z]) return res; vis[x][y][z]=true; if(y==k&&z==c){ return res=(double)0;} if(x==n) return res=(double)10000000000; if(n-x<k-y) return res=(double)10000000000; if(n-x<c-z) return res=(double)10000000000; res=f(x+1,y,z); res=min(res,f(x+1,y+1,z)+(s[x].snd/(c+1))); if(z<c){ res=min(res,f(x+1,y+1,z+1)+(s[x].fst/(z+1))); } //cout<<x<<" "<<y<<" "<<z<<" ->>>> "<<res<<'\n'; return res; } int main(){FIN; cin>>n>>k; s.clear(); s.resize(n); forn(i,0,n){ cin>>s[i].snd>>s[i].fst; if(s[i].fst==-1){ s[i].fst=(double)10000000000000000; }} sort(ALL(s)); //forn(i,0,n) cout<<s[i].fst<<" "<<s[i].snd<<'\n'; double rres = (double)100000000; forn(cc,0,k+1){ for(int i = n; i>=0; i--){ for(int j = min(i+1,k)+1; j>=0; j--){ for(int h = min(i+1,cc)+1; h>=0; h--){ dp[i][j][h]=(double)1000000000; if(n-i<cc-h) break; } if(n-i<k-j) break; } } //cout<<"empieza"<<'\n'; c=cc; forn(i,0,n+1) dp[i][k][cc]=0; for(int i = n-1; i>=0; i--){ for(int j = min(i+1,k); j>=0; j--){ if(n-i<k-j) break; for(int h = min(i+1,cc); h>=0; h--){ if(n-i<cc-h) break; double &res = dp[i][j][h]; res=dp[i+1][j][h]; if(j<k){ res=min(res,dp[i+1][j+1][h]+s[i].snd/(cc+1)); if(h<cc) res=min(res,dp[i+1][j+1][h+1]+s[i].fst/(h+1)); } //cout<<i<<" "<<j<<" "<<h<<" ->>>>> "<<res<<'\n'; } } } rres=min(rres,dp[0][0][0]); //cout<<cc<<" "<<" -------------------- "<<dp[0][0][0]<<'\n'; } //cout<<"llego\n"; cout<<fixed<<setprecision(15)<<rres<<'\n'; return 0; }
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