35 lines
867 B
JavaScript
35 lines
867 B
JavaScript
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/*
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* @lc app=leetcode id=93 lang=javascript
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*
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* [93] Restore IP Addresses
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*/
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function backtrack(list, tempList, s, start) {
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if (tempList.length === 4 && tempList.join("") === s && !list.includes(tempList.join("."))) {
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list.push(tempList.join("."));
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}
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if (tempList.length > 4) return;
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for (let i = start; i < s.length; i++) {
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for (let j = 0; j < 3; j++) {
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const r = s.slice(i, i + j + 1);
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if (+r > 255) continue;
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if (r[0] === '0' && r.length > 1) continue;
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tempList.push(r);
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backtrack(list, tempList, s, i + j + 1);
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tempList.pop();
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}
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}
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}
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/**
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* @param {string} s
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* @return {string[]}
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*/
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var restoreIpAddresses = function(s) {
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// Given "25525511135",
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// return ["255.255.11.135", "255.255.111.35"].
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if (s.length > 3 * 4) return [];
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const list = [];
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backtrack(list, [], s, 0);
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return list;
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};
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