bzoj1068

题意

bzoj

做法

令\(f_{i,j,0/1}\)为默认区间\([i,j]\)左边有一个M，区间内是否有M的最优解

• \(f_{i,j,0}\)
  \(f_{i,j,0}=min\{f_{i,k,0}+j-k\}\)
  \(f_{i,j,0}=f_{i,mid,0}+1\)
• \(f_{i,j,1}\)
  \(f_{i,j,1}=min\{min(f_{i,k,0},f_{i,k,1})+1+min(f_{k+1,j,0},f_{k+1,j,1})\}\)