1. Two Sum

Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target.

2. Plus One

You are given a large integer represented as an integer array digits, where each digits[i] is the ith digit of the integer. The digits are ordered from most significant to least significant in left-to-right order. The large integer does not contain any leading 0's. Increment the large integer by one and return the resulting array of digits.