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Roman to Integer Easy 1917 3305 Add to List Share Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M. Symbol Value I 1 V 5 X ...

Palindrome Number Easy 2058 1499 Add to List Share Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward. Example 1: Input: 121 Output: ...

String to Integer (atoi) Medium Implement atoi which converts a string to an integer. The function first discards as many whitespace characters as necessary until the first non-whitespace character ...