※ 引述《JerryChungYC (JerryChung)》之銘言： : https://leetcode.com/problems/adding-spaces-to-a-string : 2109. Adding Spaces to a String : 在指定index插空格 : Example 1: : Input: s = "LeetcodeHelpsMeLearn", spaces = [8,13,15] : Output: "Leetcode Helps Me Learn" : Example 2: : Input: s = "icodeinpython", spaces = [1,5,7,9] : Output: "i code in py thon" : Example 3: : Input: s = "spacing", spaces = [0,1,2,3,4,5,6] : Output: " s p a c i n g" : Constraints: : 1 <= s.length <= 3 * 10^5 : s 只有大小寫英文字母 : 1 <= spaces.length <= 3 * 10^5 : 0 <= spaces[i] <= s.length - 1 : spaces內的值是嚴格遞增 我以為是考雙指針 隨便寫寫贏過90% 又水了一天 Java code: -------------------------------------------------------- class Solution { public String addSpaces(String s, int[] spaces) { StringBuilder sb = new StringBuilder(); int l = 0; int r = 0; for (int space : spaces) { while (r < space) { r++; } sb.append(s, l, r).append(" "); l = r; } sb.append(s, l, s.length()); return sb.toString(); } } ---------------------------------------------------------- -- https://i.imgur.com/O931L58.jpeg -- ※ 發信站: 批踢踢實業坊(pttsite.org.tw), 來自: 49.158.191.3 (臺灣) ※ 文章網址: https://pttsite.org.tw/Marginalman/M.1733234227.A.965