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题目描述：Regular Expression MatchingImplement regular expression matching with support for'.'and'*''.' Matches any single character.'*' Matches zero or mo... 阅读全文
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题目描述：Palindrome NumberDetermine whether an integer is a palindrome. Do this without extra space.Some hints:Could negative integers be palindromes? (ie... 阅读全文
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题目描述：String to Integer (atoi)Implementatoito convert a string to an integer.Hint:Carefully consider all possible input cases. If you want a challenge,... 阅读全文
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题目描述：Reverse IntegerReverse digits of an integer.Example1:x = 123, return 321Example2:x = -123, return -321Have you thought about this?Here are some g... 阅读全文
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题目描述：ZigZag ConversionThe string"PAYPALISHIRING"is written in a zigzag pattern on a given number of rows like this: (you may want to display this patt... 阅读全文