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Practice › LeetCode › LeetCode (archived) › LeetCode 01xx ›

LeetCode 191: Number of 1 Bits

Problem Restatement We are given a positive integer n . We need to return the number of 1 bits in its binary representation. This count is also called the Hamming weight. The official problem asks for the number of set bits in the binary representation of n . A set bit means a bit whose value is 1 . For example: n = 11 binary = 1011 There are three...
leetcode bit-manipulation integer May 10, 2026
Practice › LeetCode › LeetCode (archived) › LeetCode 01xx ›

LeetCode 190: Reverse Bits

Problem Restatement We are given a 32-bit integer n . We need to reverse its 32 bits and return the integer represented by the reversed bit pattern. The official statement asks us to reverse the bits of a given 32-bit integer. For example, the binary form of 43261596 is: 00000010100101000001111010011100 After reversing all 32 bits, we get: 00111001011110000010100101000000 That binary value is 964176192 . Input and Output Item Meaning Input...
leetcode bit-manipulation integer May 10, 2026
Practice › LeetCode › LeetCode (archived) › LeetCode 00xx ›

LeetCode 9: Palindrome Number

Problem Restatement We are given an integer x . Return true if x is a palindrome integer. Return false otherwise. A palindrome reads the same forward and backward. For example: 121 is a palindrome because it reads the same from both directions. But: -121 is not a palindrome, because reversing it gives: 121- The follow-up asks whether we can solve the problem without converting the integer to a string. The...
leetcode math integer May 10, 2026
Practice › LeetCode › LeetCode (archived) › LeetCode 00xx ›

LeetCode 7: Reverse Integer

Problem Restatement We are given a signed 32-bit integer x . We need to reverse its digits. Examples: 123 -> 321 -123 -> -321 120 -> 21 If the reversed value goes outside the signed 32-bit integer range, we return 0 . The valid range is: [-2^31, 2^31 - 1] which means: [-2147483648, 2147483647] The official problem also says to assume the environment does not allow storing 64-bit integers. Input...
leetcode math integer overflow May 10, 2026