Given a string pat and an integer N, the task is to find the number of occurrences of the pattern pat in binary representation of N.
Input: N = 2, pat = “101”
Pattern “101” doesn’t occur in the binary representation of 2 (10).
Input: N = 10, pat = “101”
Binary representation of 10 is 1010 and the given pattern occurs only once.
Naive Approach: Convert the number into its binary string representation and then use a pattern matching algorithm to check the number of times the pattern has occurred in the binary representation.
- Convert the binary pattern into it’s decimal representation.
- Take an integer all_ones, whose binary representation consists of all set bits (equal to the number of bits in the pattern).
- Performing N & all_ones now will leave only the last k bits unchanged (others will be 0) where k is the number of bits in the pattern.
- Now if N = pattern, it means that N contained the pattern in the end in its binary representation. So update count = count + 1.
- Right shift N by 1 and repeat the previous two steps until N ≥ pattern & N > 0.
- Print the count in the end.
Below is the implementation of the above approach:
- Find the occurrence of the given binary pattern in the binary representation of the array elements
- Binary representation of a given number
- Binary representation of next number
- Count number of trailing zeros in Binary representation of a number using Bitset
- Check if the binary representation of a number has equal number of 0s and 1s in blocks
- Largest number with binary representation is m 1's and m-1 0's
- Binary representation of previous number
- Next greater number than N with exactly one bit different in binary representation of N
- Number of leading zeros in binary representation of a given number
- Check if binary representation of a number is palindrome
- Find the n-th number whose binary representation is a palindrome
- Prime Number of Set Bits in Binary Representation | Set 1
- Find consecutive 1s of length >= n in binary representation of a number
- Find the number obtained after concatenation of binary representation of M and N
- Check if binary representation of a given number and its complement are anagram
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to email@example.com. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.