Regular expressions, or regex, provide a powerful and flexible way to search, match, and manipulate text. Thejava.util.regexpackage supports regular expressions. Regex offers an efficient and concise solution for removing digits fromStrings. To remove digits from aString, we need a regex pattern t...
[LeetCode] 402. Remove K Digits Java 题目: Given a non-negative integernumrepresented as a string, removekdigits from the number so that the new number is the smallest possible. Note: The length ofnumis less than 10002 and will be ≥k. The givennumdoes not contain any leading zero. Ex...
util.Deque; import java.util.LinkedList; public class Solution2 { public String removeKdigits(String num, int k) { //使用双端队列来代替栈 Deque<Character> deque = new LinkedList<Character>(); //栈顶元素大于当前元素就移除 int length = num.length(); for (int i = 0; i < length; ++...
substring(str, 0, str.length() - 1); // print the new string System.out.println(str); The StringUtils.substring() method takes one extra parameter than the built-in substring(); the string you want to remove a character from.Read Next: How to extract digits from a string in Java...
class Solution { public String removeKdigits(String num, int k) { if (k <= 0) { return num; } if (num.length() == 0 || k >= num.length()) { return "0"; } int digits = num.length() - k;// 输出字符串的长度 char[] stk = new char[num.length()];// 模拟桟 int top...
402. Remove K Digits packageLeetCode_402importjava.util.*/*** 402. Remove K Digits *https://leetcode.com/problems/remove-k-digits/description/* * Given a non-negative integer num represented as a string, remove k digits from the number so that the new number is the smallest possible....
To remove non-alphanumeric characters in a given string in Java, we have three methods; let’s see them one by one. Method 1: Using ASCII values If we see the ASCII table, characters from ‘a’ to ‘z’ lie in the range 65 to 90. Characters from ‘A’ to ‘Z’ lie in the...
402. Remove K Digits Given a non-negative integer num represented as a string, remove k digits from the number so that the new number is the smallest possible. Note: The length of num is less than 10002 and will be ≥ k. The given num does not contain any leading zero....
Approach #2: Java. [stack] classSolution{publicStringremoveKdigits(Stringnum,intk){intdigits=num.length()-k;char[]stk=newchar[num.length()];inttop=0;for(inti=0;i<num.length();++i){charc=num.charAt(i);while(top>0&&stk[top-1]>c&&k>0){top--;k--;}stk[top++]=c;}intidx=0...
The [:alnum:] character class represents all alphanumeric characters (letters and digits). "" is an empty string used as the replacement string. Using sed Command Use the sed command to remove the special characters from a string in Bash. Use sed Command 1 2 3 4 5 6 #!/bin/bash ...