SWIFT

two sum

//O(n) hashmaps C++ Two Sum leetcode 
class Solution {
public:
    vector<int> twoSum(vector<int>& nums, int target) {
        unordered_map<int,int> map;
        for(int i=0; i<=nums.size();i++){
            int compliment=target-nums[i];
            if(map.count(compliment)==1){
                return {map[compliment],i};
            }
            else{
                map[nums[i]]=i;
            }
            
     	}
        return {-1,-1};
        
    }
};

1. Two Sum

class Solution {
    public:
        vector<int> twoSum(vector<int>& nums, int target) {
            unordered_map<int, int> indices;
            for(int i=0; i<nums.size(); i++) indices[nums[i]] = i;

            for(int i=0; i<nums.size(); i++){
                int left = target - nums[i];
                if (indices.count(left) && indices[left]!=i) return {i, indices[left]};
            }
            return {};
        }
    };

two sum problem

vector<int> twoSum(vector<int>& nums, int target) {
    int len = nums.size();
    for(int i = 0; i < len; i++) {
        for(int j = i + 1; j < len; j++) {
            if(nums[j] == target - nums[i])
                return { i, j };
        }
    }
    return {-1, -1};
};

two value sum

let x = 10
let y = 25
print("Sum of x and y = ", (x+y))

two sum problem

vector<int> twoSum(vector<int>& nums, int target) {
    int front = 0, rear = nums.size() - 1;
    sort(nums.begin(), nums.end());
    while(front < rear) {
      int sum = nums[front] + nums[rear];
      if (sum == target)
       break;
      else if (sum > target)
       rear--;
      else
       front++;
    }
    return {front, rear};
};

two sum solution

       vector<int> twoSum(vector<int> &nums, int target){ // Brute Force Approach
            for(int i = 0; i < nums.size(); i++){
                for(int j = i+1; j < nums.size(); j++){
                    if(nums[i] + nums[j] == target){
                        vector<int> result;
                        result.push_back(i);
                        result.push_back(j);
                        return result;
                    }
                }
            }
            return vector<int>();  // return empty vector if no two sum solution
        }

Two Sum

class Solution {
public:
    vector<int> twoSum(vector<int>& nums, int target) {
        
    }
};

Two Sum

class Solution {
    public int[] twoSum(int[] nums, int target) {
        
    }
}

Two Sum

/**
 * Note: The returned array must be malloced, assume caller calls free().
 */
int* twoSum(int* nums, int numsSize, int target, int* returnSize){

}

Two Sum

public class Solution {
    public int[] TwoSum(int[] nums, int target) {
        
    }
}

Two Sum

/**
 * @param {number[]} nums
 * @param {number} target
 * @return {number[]}
 */
var twoSum = function(nums, target) {
    
};

Two Sum

# @param {Integer[]} nums
# @param {Integer} target
# @return {Integer[]}
def two_sum(nums, target)
    
end

Two Sum

class Solution {
    func twoSum(_ nums: [Int], _ target: Int) -> [Int] {
        
    }
}

Two Sum

class Solution {

    /**
     * @param Integer[] $nums
     * @param Integer $target
     * @return Integer[]
     */
    function twoSum($nums, $target) {
        
    }
}

Two Sum

function twoSum(nums: number[], target: number): number[] {

};