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  1. Prepare
  2. Algorithms
  3. Dynamic Programming
  4. Modify The Sequence
  5. Discussions

Modify The Sequence

  • ravikumar98016
     + 1 comment

    def modifySequence(arr):

        N = len(arr)
M = (N+1)*[0]
L = 0
for i in range(0,N):
    if arr[i] < i + 1:
        continue
    if arr[i] >= arr[M[L]] + i - M[L] :
        j = L+1        
    else:
        lower = 1
        upper = L
        while lower <= upper:
            mid = int((upper+lower)/2)
            if arr[M[mid]] <= arr[i] - i + M[mid]:
                lower = mid + 1
            else:
                upper = mid - 1

        j = lower

    M[j] = i

    if j > L:
        L = j

return len(arr)-L