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方法一:栈 /** * Definition for singly-linked list. * public class ListNode { * int val; * ListNode next; * ListNode(int x) { val = x; } * } */ class Solut 阅读全文
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题目描述: 方法一:逻辑判断法:O(N) class Solution: def isNumber(self, s: str) -> bool: s = s.strip() met_dot = met_e = met_digit = False for i, char in enumerate(s) 阅读全文
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题目描述: java: package test; import java.util.ArrayList; import java.util.HashMap; import java.util.HashSet; import java.util.List; import java.util.Map; 阅读全文