如果未匹配就入栈,匹配就出栈,最后如果栈不为空或者栈顶元素不当前元素不匹配就返回false4*5*@params6*@return7*/8publicstaticbooleanisValid(String s) {9Stack<Character> stack =newStack<Character>();10for(charc : s.toCharArray()) {11if(c == '(') {12stack.push(')...
*另一种方法,把问题转换成有环链表,找环的起始节点。O(n) O(1) lc142*二分查找,每次看一边数字的个数, O(nlog(n)) O(1)*Tips:剑指offer原题*/ 1. 两数之和 1 public int[] twoSum(int[] nums, inttarget) { 2 int[] result = new int[2]; 3 Map<Integer, Integer> map = new HashM...
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Shortest Unsorted Continuous Subarray * 题意:找出数组中需要排序的长度 * 难度:Easy * 分类:Array * 思路: * Tips:可以考虑八大排序 */public class Lc581 { public static int findUnsortedSubarray(int[] nums) { int copyFromNums[] = new int[nums.length]; for (int i = 0; i < nums.length;...