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  • 简单二分法 简单

    $MapString="116.310634759589,39.990045537862,46#116.310371735567,39.989799696735005,44#116.310489333624,39.989904135209,43#116.31047961062,39.989998263946,42.5#116.310506600338,39.990206973256,52.5#116.310506600338,39.990206973256,52.5#116.311968822793,39.99050754819,43#116.312106621229,39.99047402059,43#116.31211324293001,39.990485922888006,43#116.310634759589,39.990045537862,46#116.310371735567,39.989799696735005,44#116.310489333624,39.989904135209,43#116.31047961062,39.989998263946,42.5#116.310506600338,39.990206973256,52.5#116.310506600338,39.990206973256,52.5#116.311968822793,39.99050754819,43#116.312106621229,39.99047402059,43#116.31211324293001,39.990485922888006,43#116.310634759589,39.990045537862,46#116.310371735567,39.989799696735005,44#116.310489333624,39.989904135209,43#116.31047961062,39.989998263946,42.5#116.310506600338,39.990206973256,52.5#116.310506600338,39.990206973256,52.5#116.311968822793,39.99050754819,43#116.312106621229,39.99047402059,43#116.31211324293001,39.990485922888006,43#116.310634759589,39.990045537862,46#116.310371735567,39.989799696735005,44#116.310489333624,39.989904135209,43#116.31047961062,39.989998263946,42.5#116.310506600338,39.990206973256,52.5#116.310506600338,39.990206973256,52.5#116.311968822793,39.99050754819,43#116.312106621229,39.99047402059,43#116.31211324293001,39.990485922888006,43#116.310634759589,39.990045537862,46#116.310371735567,39.989799696735005,44#116.310489333624,39.989904135209,43#116.31047961062,39.989998263946,42.5#116.310506600338,39.990206973256,52.5#116.310506600338,39.990206973256,52.5#116.311968822793,39.99050754819,43#116.312106621229,39.99047402059,43#116.31211324293001,39.990485922888006,43#116.310634759589,39.990045537862,46#116.310371735567,39.989799696735005,44#116.310489333624,39.989904135209,43#116.31047961062,39.989998263946,42.5#116.310506600338,39.990206973256,52.5#116.310506600338,39.990206973256,52.5#116.311968822793,39.99050754819,43#116.312106621229,39.99047402059,43#116.31211324293001,39.990485922888006,43#116.310634759589,39.990045537862,46#116.310371735567,39.989799696735005,44#116.310489333624,39.989904135209,43#116.31047961062,39.989998263946,42.5#116.310506600338,39.990206973256,52.5#116.310506600338,39.990206973256,52.5#116.311968822793,39.99050754819,43#116.312106621229,39.99047402059,43#116.31211324293001,39.990485922888006,43#116.310634759589,39.990045537862,46#116.310371735567,39.989799696735005,44#116.310489333624,39.989904135209,43#116.31047961062,39.989998263946,42.5#116.310506600338,39.990206973256,52.5#116.310506600338,39.990206973256,52.5#116.311968822793,39.99050754819,43#116.312106621229,39.99047402059,43#116.31211324293001,39.990485922888006,43";
    $arr = explode("#",$MapString);
    $CityArray="";
    getMapCity($arr, 10, 1, $CityArray);
    /*********************
    *@parent MapArr    数组
    *@parent number    最小数值
    *@parent i         次数
    *@parent CityArray 取得的数值
    *********************/
    function getMapCity($MapArr, $number, $i,&$CityArray){
    	if(count($MapArr) >= $number){
    		$z = ceil(count($MapArr)/2);
    		if($i==1){ //第一次取三个点信息
    		    $CityArray[]=$MapArr[0];
    			$CityArray[]=$MapArr[count($MapArr)-1];			
    		}
    		$CityArray[]=$MapArr[$z];
    		$firstArray = array_slice($MapArr,0,$z);
    		$endArray = array_slice($MapArr,$z,$z);
    		getMapCity($firstArray,$number,++$i, $CityArray);
    		getMapCity($endArray,$number,++$i,$CityArray);
    	}
    }
    echo "<h1>CityArray</h1>";
    var_dump($CityArray);
    

      

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  • 原文地址:https://www.cnblogs.com/xiangxiaodong/p/2354511.html
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