<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>运算路线查找算法</title>
<script type="text/javascript" >
var BLACKHOLENMB = 6174;
var count = 0;
function blackHole(nmb) {
if (isNaN(nmb) || nmb < 1000 || nmb > 9999) {
return -1;
}
count++;
var tempArray = (nmb + "").split("");
var smallNmb = parseInt(tempArray.sort().join(""));
var bigNmb = parseInt(tempArray.reverse().join(""));
var d_value = bigNmb - smallNmb;
log(bigNmb, smallNmb, d_value, count);
if (d_value != BLACKHOLENMB) {
return blackHole(d_value);
} else {
return count;
}
}
function log(big, small, d_value, count) {
console.log("step " + count + ":" + big + "-" + small + "=" + d_value);
}
console.log(blackHole(2167));
</script>
</head>
<body>
</body>
</html>
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