_13_romanToInt, 1 _14_longestCommonPrefix, 0.5 _20_isValidBracket, 1 _21_mergeTwoLists， 1 _26_removeDuplicates, 1 _35_searchInsert， 1
_3_lengthOfLongestSubstring, 1 _4_longestPalindrome, 2 _6_zConvert，2 _7_reverseInteger, 0.5 _8_myAtoi, 1 _47_permuteUnique, 1 _45_jump, 1