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test.html
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test.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<script>
/**
* @param {string} s
* @return {string[]}
*/
const backTrick = (s, start, tempList, res) => {
if (start >= s.length && tempList.length === 4) {
res.push([...tempList]);
return;
}
if (start >= s.length && tempList.length !== 4) {
return;
}
if (tempList.length > 4) {
return;
}
for (let i = start; i < s.length; i++) {
const tempS2 = s.substring(i, i + 3)i
if (+tempS2 >= 100 && +tempS2 <= 255) {
tempList.push(tempS2);
backTrick(s, start + 3, tempList, res);
tempList.pop();
}
const tempS1 = s.substring(i, i + 2);
if (+tempS1 >= 10 && +tempS1 <= 99) {
tempList.push(tempS1);
backTrick(s, start + 2, tempList, res);
tempList.pop();
}
const tempS = s.substring(i, i + 1);
if (+tempS > 0) {
tempList.push(tempS);
backTrick(s, i + 1, tempList, res);
tempList.pop();
}
}
};
function test(s) {
const res = [];
backTrick(s, 0, [], res);
return res;
}
test("")
</script>
</head>
<body></body>
</html>