Leetcode 1 Two Sum Solution in c++ | Hindi Coding Community

 

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

You may assume that each input would have exactly one solution, and you may not use the same element twice.

You can return the answer in any order.

You have to write a code for this problem. We have implemented the code in cpp Language. Hindi Coding Community provides you the best solutions of this problem. 

 

Example 1:

Input: nums = [2,7,11,15], target = 9
Output: [0,1]
Explanation: Because nums[0] + nums[1] == 9, we return [0, 1].

Example 2:

Input: nums = [3,2,4], target = 6
Output: [1,2]

Example 3:

Input: nums = [3,3], target = 6
Output: [0,1]

 

Constraints:

• 2 <= nums.length <= 104
• -109 <= nums[i] <= 109
• -109 <= target <= 109
• Only one valid answer exists.

class Solution {

public:

vector<int> twoSum(vector<int>& nums, int target) {

unordered_map<int, int>m;

for(int i = 0; i < nums.size(); i++){

if(m.count(target - nums[i])) return {m[target - nums[i]], i};

m[nums[i]] = i;

}

}

};