oj.uz

Submission #734578

# Submission time Handle Problem Language Result Execution time Memory
734578 2023-05-02T16:38:11 Z 1075508020060209tc Let's Win the Election (JOI22_ho_t3) C++14
21 / 100
 284 ms 4308 KB 
#include<bits/stdc++.h>
using namespace std;
//#define double long double
int n;int K;
int M;
pair<int,int>ar[200005];
double ans;

double dp[510][510];
int srtsf[510][510];
int srtps[510][510];
bool cmp(pair<int,int>i,pair<int,int>j){
if(i.second<j.second){return 1;}
if(i.second>j.second){return 0;}
if(i.first<j.first){return 1;}
return 0;
}

double solve(int m){

for(int i=0;i<=n;i++){
    for(int j=0;j<=n;j++){
        dp[i][j]=1000000;
    }
}

dp[1][0]=(double)ar[1].first/(double)(m+1);
dp[1][1]=ar[1].second;

for(int i=1;i<=n;i++){
    for(int j=0;j<=m;j++){
        if(dp[i][j]>500000){continue;}
        dp[i+1][j]=min(dp[i+1][j],dp[i][j]+(double)ar[i+1].first/(double)(m+1));
        dp[i+1][j+1]=min(dp[i+1][j+1],dp[i][j]+(double)ar[i+1].second/(double)(j+1));
    }
}
double ret=dp[K][m];
//cout<<fixed<<setprecision(6)<<ret<<"  ";
for(int i=K-1;i>=m;i--){
    ret=min(ret,dp[i][m]+(double)srtps[i+1][i+1+K-i-1]/(double)(m+1));
}
//cout<<fixed<<setprecision(6)<<ret<<endl;
return ret;
}


signed main(){
cin>>n>>K;
M=0;
for(int i=1;i<=n;i++){
    cin>>ar[i].first>>ar[i].second;
    if(ar[i].second==-1){
        ar[i].second=200000;
    }else{
        M++;
    }
}

sort(ar+1,ar+n+1,cmp);
/*
cout<<endl;
for(int i=1;i<=n;i++){
    cout<<ar[i].first<<" "<<ar[i].second<<endl;
}
cout<<endl;
*/
for(int i=1;i<=n;i++){

    for(int j=i;j<=n;j++){
        srtsf[i][j]=ar[j].first;
        //srtps[i][j]=srtsf[i][j]+srtps[i][j-1];
    }
    sort(srtsf[i]+i,srtsf[i]+n+1);
    for(int j=i;j<=n;j++){
        srtps[i][j]=srtsf[i][j]+srtps[i][j-1];
    }
}
/*
for(int i=1;i<=n;i++){

    for(int j=1;j<=n;j++){
        cout<<srtsf[i][j]<<" ";
    }cout<<endl;

}
*/



ans=5000000;
for(int i=0;i<=min(K,M);i++){
    ans=min(ans,solve(i));
}
cout<<fixed<<setprecision(6)<<ans<<endl;




/*


double l=0;double r=500000;
for(int ttt=0;ttt<90;ttt++){
    double mi=(l+r)/2;
    if(ok(mi)){
        l=mi;
    }else{
        r=mi;
    }
}

cout<<fixed<<setprecision(6)<<l<<endl;


*/

}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 4 ms 4308 KB Output is correct
6 Correct 4 ms 4308 KB Output is correct
7 Correct 4 ms 4308 KB Output is correct
8 Correct 4 ms 4308 KB Output is correct
9 Correct 5 ms 4308 KB Output is correct
10 Correct 4 ms 4308 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 4 ms 4308 KB Output is correct
6 Correct 4 ms 4308 KB Output is correct
7 Correct 4 ms 4308 KB Output is correct
8 Correct 4 ms 4308 KB Output is correct
9 Correct 5 ms 4308 KB Output is correct
10 Correct 4 ms 4308 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 56 ms 4308 KB Output is correct
13 Correct 48 ms 4292 KB Output is correct
14 Correct 39 ms 4308 KB Output is correct
15 Correct 155 ms 4308 KB Output is correct
16 Correct 134 ms 4292 KB Output is correct
17 Correct 33 ms 4180 KB Output is correct
18 Correct 258 ms 4308 KB Output is correct
19 Correct 129 ms 4308 KB Output is correct
20 Correct 29 ms 4308 KB Output is correct

Subtask #3
0 / 11.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 33.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 264 ms 4308 KB Output is correct
2 Correct 278 ms 4308 KB Output is correct
3 Correct 257 ms 4308 KB Output is correct
4 Correct 252 ms 4308 KB Output is correct
5 Correct 280 ms 4292 KB Output is correct
6 Correct 278 ms 4308 KB Output is correct
7 Correct 284 ms 4308 KB Output is correct

Subtask #7
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 4 ms 4308 KB Output is correct
6 Correct 4 ms 4308 KB Output is correct
7 Correct 4 ms 4308 KB Output is correct
8 Correct 4 ms 4308 KB Output is correct
9 Correct 5 ms 4308 KB Output is correct
10 Correct 4 ms 4308 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Correct 56 ms 4308 KB Output is correct
13 Correct 48 ms 4292 KB Output is correct
14 Correct 39 ms 4308 KB Output is correct
15 Correct 155 ms 4308 KB Output is correct
16 Correct 134 ms 4292 KB Output is correct
17 Correct 33 ms 4180 KB Output is correct
18 Correct 258 ms 4308 KB Output is correct
19 Correct 129 ms 4308 KB Output is correct
20 Correct 29 ms 4308 KB Output is correct
21 Incorrect 0 ms 340 KB Output isn't correct
22 Halted 0 ms 0 KB -