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.

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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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