# 复原IP地址
leetcode - 93.复原IP地址 (opens new window)
给定一个只包含数字的字符串,复原它并返回所有可能的 IP 地址格式。
示例:
输入: "25525511135"
输出: ["255.255.11.135", "255.255.111.35"]
# Johninch
const restoreIpAddresses = function(str) {
let result = []
let helper = (cur, sub) => {
if (sub.length > 12) {
return
}
if (cur.length === 4 && cur.join('') === str) {
result.push(cur.join('.'))
} else {
for(let i = 0, len = Math.min(3, sub.length), temp; i < len; i++) {
temp = sub.slice(0, i + 1)
if (temp < 256) {
helper(cur.concat([temp * 1]), sub.slice(i + 1)) // 转换下数据类型,如 01为1(LeetCode测试用例)
}
}
}
}
helper([], str)
return result
};