1. Two Sum.cpp

/*Two Sum:Given an array of integers, return indices of the two numbers such that they add up to a specific target.
You may assume that each input would have exactly one solution, and you may not use the same element twice.*/
class Solution {
public:
    vector<int> twoSum(vector<int>& nums, int target) {
    	vector<int> res;
        for(int i = 0; i < nums.size(); i++){
        	for(int j = i+1; j < nums.size(); j++){
        		if(nums[i] + nums[j] == target && i != j){
        			res.push_back(i);
        			res.push_back(j);
        			return res;
        		}
        	}
        }
        return res;
    }
};