oj.uz

Submission #540399

# Submission time Handle Problem Language Result Execution time Memory
540399 2022-03-20T09:53:46 Z krit3379 Watching (JOI13_watching) C++14
100 / 100
 207 ms 31696 KB 
#include<bits/stdc++.h>
using namespace std;
#define N 2005

long long a[N],dp[N][N],l,r,mid,ans;

int main(){
    int n,i,j,p,q,prep,preq;
    scanf("%d %d %d",&n,&p,&q);
    for(i=1;i<=n;i++)scanf("%lld",&a[i]);
    sort(a+1,a+n+1);
    if(p+q>=n){printf("1");return 0;}
    l=1,r=1e9;
    while(l<=r){
        mid=(l+r)/2;
        for(i=n;i>0;i--){
            prep=lower_bound(a+1,a+n+1,a[i]+mid)-a;
            preq=lower_bound(a+1,a+n+1,a[i]+2*mid)-a;
            for(j=0;j<=p;j++){
                dp[i][j]=1e18;
                if(j>0)dp[i][j]=min(dp[i][j],dp[prep][j-1]);
                dp[i][j]=min(dp[i][j],dp[preq][j]+1);
            }
        }
        if(dp[1][p]<=q)ans=mid,r=mid-1;
        else l=mid+1;
    }
    printf("%lld",ans);
    return 0;
}

Compilation message

watching.cpp: In function 'int main()':
watching.cpp:9:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |     scanf("%d %d %d",&n,&p,&q);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~
watching.cpp:10:27: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |     for(i=1;i<=n;i++)scanf("%lld",&a[i]);
      |                      ~~~~~^~~~~~~~~~~~~~

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 724 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 ms 724 KB Output is correct
8 Correct 1 ms 724 KB Output is correct
9 Correct 1 ms 724 KB Output is correct
10 Correct 1 ms 724 KB Output is correct
11 Correct 1 ms 724 KB Output is correct
12 Correct 1 ms 724 KB Output is correct
13 Correct 1 ms 724 KB Output is correct
14 Correct 1 ms 724 KB Output is correct
15 Correct 1 ms 724 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 8404 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 8 ms 8532 KB Output is correct
8 Correct 20 ms 10196 KB Output is correct
9 Correct 96 ms 20120 KB Output is correct
10 Correct 207 ms 31696 KB Output is correct
11 Correct 17 ms 9684 KB Output is correct
12 Correct 113 ms 23636 KB Output is correct
13 Correct 9 ms 8532 KB Output is correct
14 Correct 13 ms 8660 KB Output is correct
15 Correct 10 ms 8652 KB Output is correct