Problem of The Day: First Missing Positive
Problem Statement ``` Given an unsorted integer array nums, return the smallest missing positive integer.
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Problem of The Day: Find the Index of the First Occurrence in a String
Problem Statement ``` Given two strings needle and haystack, return the index of the first occurrence of needle in haystack, or -1 if needle is not part of h...
Problem of The Day: Find the Duplicate Number
Problem Statement ``` Given an array of integers nums containing n + 1 integers where each integer is in the range [1, n] inclusive.
Problem of The Day: Evaluate Reverse Polish Notation
Problem Statement see problem
Problem of The Day: Single Number
Problem Statement ``` Given a non-empty array of integers nums, every element appears twice except for one. Find that single one.