Yu's garden

摘要： Roman to IntegerGiven a roman numeral, convert it to an integer.Input is guaranteed to be within the range from 1 to 3999.SOLUTION 1：思路：从后往前遍历罗马数字，如果某... 阅读全文

摘要： Roman to IntegerGiven a roman numeral, convert it to an integer.Input is guaranteed to be within the range from 1 to 3999.SOLUTION 1:思路：从后往前遍历罗马数字，如果某... 阅读全文

摘要： Integer to Roman Given an integer, convert it to a roman numeral.Input is guaranteed to be within the range from 1 to 3999.SOLUTION 1:从大到小的贪心写法。从大到小匹配... 阅读全文

摘要： ZigZag ConversionThe string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern... 阅读全文

摘要： Multiply StringsGiven two numbers represented as strings, return multiplication of the numbers as a string.Note: The numbers can be arbitrarily large ... 阅读全文

摘要： Wildcard MatchingImplement wildcard pattern matching with support for '?' and '*'.'?' Matches any single character.'*' Matches any sequence of charact... 阅读全文