力扣第2341题

今天简单题,感觉又行了

<?php
class Solution {
    
    
	
	/**
	 * @param Integer[] $nums
	 * @return Integer[]
	 */
	function numberOfPairs1($nums) {
    
    
		$arr = array_count_values($nums);
		$res = 0;
		foreach ($arr as $v) {
    
    
			$res += floor($v/2);
		}
		return [$res, count($nums)-$res*2];
	}
	
	function numberOfPairs2($nums) {
    
    
		$res = 0;
		$arr = [];
		foreach ($nums as$num) {
    
    
			if (isset($arr[$num])) {
    
    
				$res++;
				unset($arr[$num]);
			} else {
    
    
				$arr[$num] = 1;
			}
		}
		return [$res, count($arr)];
	}
}

$solution = new Solution();
var_dump($solution->numberOfPairs2([1,3,2,1,3,2,2]));