a67879431的博客

简单题20 有效的括号解法一题解思路相关知识解法一class Solution { public boolean isValid(String s) { Stack<Character> stack = new Stack<Character>(); for(char c: s.toCharArray()){ if(c=='('){ stack.push(')');

简单题20 有效的括号解法1相关知识点解法1class Solution { public boolean isValid(String s) { Stack<Character> stack = new Stack<Character>(); for(char c: s.toCharArray()){ if(c=='(')stack.push(')'); else if(c=='[')sta

简单题7 整数翻转解法1相关知识点解法1 public int reverse(int x) { String xString = Integer.toString(x); String string = xString; int flag = 1; if (x < 0) { flag = -1; string = xString.substring(1); }