oj.uz

Submission #316637

# Submission time Handle Problem Language Result Execution time Memory
316637 2020-10-26T23:53:06 Z Dymo Watching (JOI13_watching) C++14
100 / 100
 268 ms 38272 KB 
#include<bits/stdc++.h>

using namespace std;


#define pb    push_back
#define ll long long
#define pll pair<ll,ll>
#define ff first
#define ss second
#define endl "\n"
const ll maxn=5e3+50;
const ll mod =1e9+7;
const ll base=317;
ll p, q, n ;
ll a[maxn];
ll dp[maxn][maxn];

bool chk(ll len)
{
 // memset(dp,0 ,sizeof (dp));
  ll l=1, r=1;
  for (int i=1;i<=n;i++)
  {
      while (a[l]<a[i]-len+1) l++;
      while (a[r]<a[i]-2*len+1) r++;
      for (int j=0;j<=p;j++)
      {
          dp[i][j]=1e15;
         if (j)dp[i][j]=dp[l-1][j-1];
         dp[i][j]=min(dp[r-1][j]+1,dp[i][j]);
      }
  }
  if (dp[n][p]<=q) return true;
  return false;

}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    if (fopen("test.t", "r"))
    {
        freopen("test.inp", "r", stdin);
        freopen("test.out", "w", stdout) ;
    }
    cin>>n>> p>> q;
    for (int i=1;i<=n;i++) cin>>a[i];
    sort(a+1,a+n+1);
    if (p+q>=n)
    {
        cout << 1;
        return 0;
    }
    ll l=1, h= 1e10;
    while (l<=h)
    {
        ll mid=(l+h)/2;
        if (chk(mid)) h=mid-1;
        else l=mid+1;
    }
    cout <<l;









}

Compilation message

watching.cpp: In function 'int main()':
watching.cpp:47:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   47 |         freopen("test.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
watching.cpp:48:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   48 |         freopen("test.out", "w", stdout) ;
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 768 KB Output is correct
2 Correct 0 ms 256 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 0 ms 384 KB Output is correct
7 Correct 1 ms 768 KB Output is correct
8 Correct 1 ms 768 KB Output is correct
9 Correct 1 ms 768 KB Output is correct
10 Correct 1 ms 896 KB Output is correct
11 Correct 1 ms 768 KB Output is correct
12 Correct 1 ms 768 KB Output is correct
13 Correct 1 ms 768 KB Output is correct
14 Correct 1 ms 768 KB Output is correct
15 Correct 1 ms 768 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 8576 KB Output is correct
2 Correct 1 ms 288 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 512 KB Output is correct
7 Correct 10 ms 8704 KB Output is correct
8 Correct 26 ms 10496 KB Output is correct
9 Correct 118 ms 20340 KB Output is correct
10 Correct 268 ms 38272 KB Output is correct
11 Correct 20 ms 9856 KB Output is correct
12 Correct 146 ms 23808 KB Output is correct
13 Correct 9 ms 8736 KB Output is correct
14 Correct 10 ms 8832 KB Output is correct
15 Correct 10 ms 8832 KB Output is correct