算法练习--ABCD*E=DCBA

//1.ABCD * E = DBCA
//2.A,B,C,D {0-9} , E {1-9}
//3.A,B,C,D,E all different 

var existSameN = function (arr){


for(var i = 0; i < arr.length; i++){
for(var j = 0; j < arr.length ; j++){
if(j == i){continue;}
if(arr[i] == arr[j]) {return true;}
}
}


return false;
}


var ret = new Array();


for(var i = 1000; i< 9999; i++){
var strI = i.toString();
var arr = new Array(strI[0],strI[1],strI[2],strI[3]);
if(existSameN(arr)){continue;}


var reverseI = parseInt(strI[3] + strI[2]+strI[1]+strI[0]);


for(var j = 1; j<= 9 ; j++){if(i * j == reverseI) {ret.push( {num:i,mul:j});}}
}


for(var i = 0;i < ret.length; i++)
console.log("number : " + ret[i].num + ", multiply  by : " + ret[i].mul);