459.Repeated Substring Pattern

tags: Easy String

459. Repeated Substring Pattern

題目描述

Given a string s, check if it can be constructed by taking a substring of it and appending multiple copies of the substring together.

範例

Example 1:

Input: s = "abab"
Output: true
Explanation: It is the substring "ab" twice.

Example 2:

Input: s = "aba"
Output: false

Example 3:

Input: s = "abcabcabcabc"
Output: true
Explanation: It is the substring "abc" four times or the substring "abcabc" twice.

Constraints:

• 1 <= s.length <= 10⁴
• s consists of lowercase English letters.

解答

Javascript

function repeatedSubstringPattern(s) {
  const len = s.length >> 1;
  let subString = '';

  for (let i = 0; i < len; i++) {
    subString += s[i];
    let tempString = subString;

    while (tempString.length < s.length) {
      tempString += subString;
    }

    if (tempString === s) return true;
  }

  return false;
}

function repeatedSubstringPattern2(s) {
  return s.repeat(2).slice(1, -1).includes(s);
}

下面一行的解是我弟教我的，跟鬼一樣。
MarsgoatAug 21, 2023

Reference

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