1562. Find Latest Group of Size M

Given an array arr that represents a permutation of numbers from 1 to n. You have a binary string of size n that initially has all its bits set to zero. At each step i (assuming both the binary string and arr are 1-indexed) from 1 to n, the bit at position arr[i] is set to 1. You are also given an integer m. Find the latest step at which there exists a group of ones of length m. A group of ones