## LeetCode 911. Online Election

题目 In an election, the i-th vote was cast for persons[i] at time times[i]. Now, we would like to implement the following query function: »

题目 In an election, the i-th vote was cast for persons[i] at time times[i]. Now, we would like to implement the following query function: »

题目 Given a set of candidate numbers (candidates) (without duplicates) and a target number (target), find all unique combinations in candidates where the candidate numbers sums »

题目 Given a collection of candidate numbers (candidates) and a target number (target), find all unique combinations in candidates where the candidate numbers sums to target. »

题目 Find all possible combinations of k numbers that add up to a number n, given that only numbers from 1 to 9 can be used »

题目 Given an integer array with all positive numbers and no duplicates, find the number of possible combinations that add up to a positive integer target. »