Algorithm

1. 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.

function twoSum( $target,$nums) {
    $arr = [];
    foreach($nums as $k=>$v){
        $num = $target-$v;
      if(isset($arr[$num])){
        return [$arr[$num],$k];
      };
      $arr[$v] = $k;
    }
    return;
}

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