oj.uz

Submission #241048

# Submission time Handle Problem Language Result Execution time Memory
241048 2020-06-22T11:37:33 Z computerbox Watching (JOI13_watching) C++14
50 / 100
 219 ms 32120 KB 
#include <bits/stdc++.h>
#define FLASH ios_base::sync_with_stdio(0);
#define ll long long
#define debt(x,y)cout<<"#x = "<<(x)<<" and "<<"#y = "<<(y)<<endl;
#define deb(x)cout<<"#x = "<<(x)<<endl;
#define pb push_back
#define mp make_pair
#define all(x) (x).begin(), (x).end()
#define endl "\n"
#define arr(a,n) for(ll i=1;i<=n;i++) cout<<a[i]<<" "; cout << "\n";
#define vecc(a,n) for(ll i=0;i<n;i++) cout<<a[i]<<" "; cout << "\n";


using namespace std;

ll dp[2010][2010];
vector<ll>massiv;
ll n,p,q;

ll f(ll w)
{
  memset(dp,0,sizeof(dp));
  ll pointbig=0;
  ll pointsmall=0;
  for(ll i=0;i<n;i++)
  {
	while(pointsmall<n && massiv[i]-massiv[pointsmall]>=w)pointsmall++;
	while(pointbig<n && massiv[i]-massiv[pointbig]>=2*w)pointbig++; 
	for(ll j=0;j<=min(q,n);j++)
	{
	  if(j==0)
	  {
		if(pointsmall==0)dp[i][j]=1;  
		else dp[i][j]=dp[pointsmall-1][j]+1;
	  }
	  else
	  {
	   if(pointbig==0)dp[i][j]=0;
	   else if(pointsmall==0)dp[i][j]=min(dp[pointbig-1][j-1],1LL);
	   else dp[i][j]=min(dp[pointsmall-1][j]+1,dp[pointbig-1][j-1]); 	
	  } 
    } 
  }
  ll minn=LLONG_MAX;
  
  
  for(ll i=0;i<=min(q,n);i++)minn=min(minn,dp[n-1][i]);
  if(minn<=p)return 1;
  else return 0;	
}


int main(){
FLASH;
cin>>n>>p>>q;
for(ll i=1;i<=n;i++){ll x;cin>>x;massiv.pb(x);}
if(q+p>=n){cout<<1<<endl;return 0;}
sort(all(massiv));
ll nac=0;
ll konec=1e9;
ll minn=LONG_MAX;
while(nac<=konec)
{
  ll mid=nac+konec>>1;
  ll check=f(mid);
  if(check==1){minn=mid;konec=mid-1;}
  else nac=mid+1;	
}

cout<<minn<<endl;




return 0;
}

Compilation message

watching.cpp: In function 'int main()':
watching.cpp:64:13: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   ll mid=nac+konec>>1;
          ~~~^~~~~~

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 128 ms 32120 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 129 ms 32000 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 148 ms 32044 KB Output is correct
8 Correct 149 ms 32096 KB Output is correct
9 Correct 128 ms 32000 KB Output is correct
10 Correct 132 ms 32000 KB Output is correct
11 Correct 127 ms 32000 KB Output is correct
12 Correct 130 ms 32000 KB Output is correct
13 Correct 127 ms 32000 KB Output is correct
14 Correct 128 ms 32000 KB Output is correct
15 Correct 128 ms 32000 KB Output is correct

Subtask #2
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 152 ms 31992 KB Output is correct
2 Correct 4 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 149 ms 32120 KB Output is correct
8 Correct 219 ms 32000 KB Output is correct
9 Correct 146 ms 32000 KB Output is correct
10 Incorrect 168 ms 31992 KB Output isn't correct
11 Halted 0 ms 0 KB -