<?php
//百牛百钱 公牛5文一只，母牛3文一只，小牛1文3只
//一百只牛刚好100文钱
//正常思维 x+y+z=100 5x+3y+1/3z=100;
//代码逻辑 枚举法 6数字 000000-999999
//公牛数量0-100 母牛0-100 小***0-100
//公牛$x只 ，母牛$Y只，小牛$z只
header("Content-type:text/html;charset=utf-8;");
for($x=0;$x<=100;$x++){
    
    for($y=0;$y<=100;$y++){
        
        for($z=0;$z<=100;$z++){
            if(($x+$y+$z==100)&&($x*5+$y*3+$z/3==100)){
            echo "公牛{$x}只,母牛{$y}只,小牛{$z}只<br />";
            }
        }
    }
}
?>