LeetCode 202. Happy Number
Description https://leetcode.com/problems/happy-number/ Write an algorithm to determine if a number is “happy”. A happy number is a number defined by…
Category: Math
LeetCode 13. Roman to Integer
Description Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M. Symbol Value I 1 V 5 X 10 L 50 C…
LeetCode 6. ZigZag Conversion
Description https://leetcode.com/problems/zigzag-conversion/description/ The string “PAYPALISHIRING” is written in a zigzag pattern on a given number of rows like this: (you may want…
LeetCode 412. Fizz Buzz
Description https://leetcode.com/problems/fizz-buzz/ Write a program that outputs the string representation of numbers from 1 to n. But for multiples of three…
LeetCode 9. Palindrome Number
Description https://leetcode.com/problems/palindrome-number/ Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward. Example 1:…
LeetCode 7. Reverse Integer
Description https://leetcode.com/problems/reverse-integer/ Reverse digits of an integer. Example1: x = 123, return 321Example2: x = -123, return -321 Explanation The…