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Submission #328705

# Submission time Handle Problem Language Result Execution time Memory
328705 2020-11-17T17:50:14 Z a_player Watching (JOI13_watching) C++14
50 / 100
 125 ms 14188 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
const int nax=2e3+3;
int n,p,q;
ll a[nax];
int dp[nax][nax];
bool check(ll w){
  for(int i=0;i<n;i++){
    int ppp=0;
    while(i-ppp>=0&&a[i]-w+1LL<=a[i-ppp])ppp++;
    int pp=0;
    while(i-pp>=0&&a[i]-2LL*w+1<=a[i-pp])pp++;
    for(int j=0;j<=q;j++){
      if(i-ppp<0)dp[i][j]=1;
      else dp[i][j]=dp[i-ppp][j]+1;
      if(j!=0){
      if(i-pp<0)dp[i][j]=0;
      else dp[i][j]=min(dp[i][j],dp[i-pp][j-1]);
    }
    }
  }
  return dp[n-1][q]<=p;
}

int main(){
  cin>>n>>p>>q;
  if(p+q>=n){
    cout<<1<<endl;
    return 0;
  }
  for(int i=0;i<n;i++)cin>>a[i];
  sort(a,a+n);
  ll x=-1;
  for(ll b=1e9;b>=1LL;b/=2LL)
  while(!check(x+b))x+=b;
  cout<<x+1<<endl;
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 748 KB Output is correct
2 Correct 0 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 0 ms 364 KB Output is correct
7 Correct 1 ms 748 KB Output is correct
8 Correct 1 ms 748 KB Output is correct
9 Correct 1 ms 748 KB Output is correct
10 Correct 2 ms 748 KB Output is correct
11 Correct 1 ms 748 KB Output is correct
12 Correct 1 ms 748 KB Output is correct
13 Correct 1 ms 748 KB Output is correct
14 Correct 1 ms 748 KB Output is correct
15 Correct 1 ms 748 KB Output is correct

Subtask #2
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 110 ms 8428 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 0 ms 364 KB Output is correct
7 Correct 43 ms 8428 KB Output is correct
8 Correct 125 ms 14188 KB Output is correct
9 Correct 40 ms 9384 KB Output is correct
10 Incorrect 32 ms 9068 KB Output isn't correct
11 Halted 0 ms 0 KB -