Submission #1101399

#	Time	Username	Problem	Language	Result	Execution time	Memory
1101399		nguyhoangphu	K blocks (IZhO14_blocks)	C++17	0 / 100	2 ms	2644 KiB

blocks

#include <bits/stdc++.h>
using namespace std;
#define mask(i) (1<<i)
const int N=1e5;
int n,k,res=1e9;
int a[N+2],mx[N+2][21];
int get(int l,int r)
{
  int k=__lg(r-l+1);
  return max(mx[l][k],mx[r-mask(k)+1][k]);
}
int main() 
{
  ios_base::sync_with_stdio(0);
  cin.tie(0);cout.tie(0);
  cin>>n>>k;
  for (int i=1;i<=n;i++) cin>>a[i],mx[i][0]=a[i],a[i]+=a[i-1];
  for (int j=1;mask(j)<=n;j++)
  for (int i=1;i+mask(j)-1<=n;i++)
  mx[i][j]=max(mx[i][j-1],mx[i+mask(j-1)][j-1]);
  for (int i=0;i<=k-1;i++)
  {
    int l=1+i,r=n-(k-1-i);
    if (get(l,r)==get(1,n))
    {
      res=min(res,get(l,r)+a[l-1]+a[n]-a[r]);
    }
  }
  cout<<res;
}

Compilation message (stderr)

blocks.cpp: In function 'int main()':
blocks.cpp:20:38: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   20 |   mx[i][j]=max(mx[i][j-1],mx[i+mask(j-1)][j-1]);
      |                                     ~^~
blocks.cpp:3:21: note: in definition of macro 'mask'
    3 | #define mask(i) (1<<i)
      |                     ^

• Subtask 1: 0 / 14
• Subtask 2: 0 / 18
• Subtask 3: 0 / 21
• Subtask 4: 0 / 47