LeetCode-in-Java
2129. Capitalize the Title
Easy
You are given a string title consisting of one or more words separated by a single space, where each word consists of English letters. Capitalize the string by changing the capitalization of each word such that:
- If the length of the word is
1or2letters, change all letters to lowercase. - Otherwise, change the first letter to uppercase and the remaining letters to lowercase.
Return the capitalized title.
Example 1:
Input: title = “capiTalIze tHe titLe”
Output: “Capitalize The Title”
Explanation: Since all the words have a length of at least 3, the first letter of each word is uppercase, and the remaining letters are lowercase.
Example 2:
Input: title = “First leTTeR of EACH Word”
Output: “First Letter of Each Word”
Explanation:
The word “of” has length 2, so it is all lowercase.
The remaining words have a length of at least 3, so the first letter of each remaining word is uppercase, and the remaining letters are lowercase.
Example 3:
Input: title = “i lOve leetcode”
Output: “i Love Leetcode”
Explanation:
The word “i” has length 1, so it is lowercase.
The remaining words have a length of at least 3, so the first letter of each remaining word is uppercase, and the remaining letters are lowercase.
Constraints:
1 <= title.length <= 100titleconsists of words separated by a single space without any leading or trailing spaces.- Each word consists of uppercase and lowercase English letters and is non-empty.
Solution
public class Solution {
public String capitalizeTitle(String title) {
StringBuilder sb = new StringBuilder();
int i = 0;
int j = 0;
while (i < title.length()) {
while (j < title.length() && title.charAt(j) != ' ') {
sb.append(Character.toLowerCase(title.charAt(j)));
j++;
}
int len = j - i;
if (len > 2) {
sb.setCharAt(i, Character.toUpperCase(title.charAt(i)));
}
if (j == title.length()) {
break;
}
sb.append(title.charAt(j));
i = ++j;
}
return sb.toString();
}
}