oj.uz

Submission #51470

# Submission time Handle Problem Language Result Execution time Memory
51470 2018-06-18T03:36:20 Z mergesort Watching (JOI13_watching) C++14
50 / 100
 112 ms 3964 KB 
#include<bits/stdc++.h>
using namespace std;
int a[2005],n,p,q;
int len1[2005],len2[2005],dp[2005][2005];
bool check(int w)
{
    for(int i=1;i<=n;++i){
        len1[i]=len2[i]=i;
        for(int j=i+1;j<=n;++j){
            if(a[i]+w-1>=a[j])len1[i]=j;
            if(a[i]+2*w-1>=a[j])len2[i]=j;
        }
    }
    len1[n+1]=len2[n+1]=n;
    dp[0][1]=len2[1];dp[1][0]=len1[1];
    for(int i=1;i<=p;++i){
        for(int j=1;j<=q;++j){
            int pos1=dp[i-1][j],pos2=dp[i][j-1];
            if(pos1>=n || pos2>=n)dp[i][j]=n;
            pos1++;
            pos2++;
            dp[i][j]=max(len1[pos1],len2[pos2]);
        }
    }
    if(dp[p][q]>=n)return true;
    else return false;
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin>>n>>p>>q;
    for(int i=1 ;i<=n;++i)cin>>a[i];
    sort(a+1,a+1+n);
    if(p+q>=n){
        cout<<"1";
        return 0;
    }
    int l=0,r=1e9;
    while(l+1<r){
        int mid=(l+r)/2;
        if(check(mid))r=mid;
        else l=mid;
    }
    //cout<<check(4)<<"\n****"<<endl;
    int ans=1e9;
    if(check(r))ans=min(ans,r);
    if(check(l))ans=min(ans,l);
    cout<<ans;
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 392 KB Output is correct
4 Correct 2 ms 468 KB Output is correct
5 Correct 2 ms 468 KB Output is correct
6 Correct 3 ms 484 KB Output is correct
7 Correct 3 ms 484 KB Output is correct
8 Correct 6 ms 488 KB Output is correct
9 Correct 2 ms 612 KB Output is correct
10 Correct 2 ms 672 KB Output is correct
11 Correct 3 ms 876 KB Output is correct
12 Correct 3 ms 876 KB Output is correct
13 Correct 2 ms 876 KB Output is correct
14 Correct 2 ms 876 KB Output is correct
15 Correct 2 ms 876 KB Output is correct

Subtask #2
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 65 ms 876 KB Output is correct
2 Correct 2 ms 876 KB Output is correct
3 Correct 2 ms 876 KB Output is correct
4 Correct 2 ms 876 KB Output is correct
5 Correct 2 ms 876 KB Output is correct
6 Correct 2 ms 876 KB Output is correct
7 Correct 86 ms 876 KB Output is correct
8 Correct 112 ms 1532 KB Output is correct
9 Incorrect 108 ms 3964 KB Output isn't correct
10 Halted 0 ms 0 KB -