Bilingual: java and c++
Evaluate the value of an arithmetic expression in Reverse Polish Notation.
Valid operators are
+,-,*,/. Each operand may be an integer or another expression.Some examples:
["2", "1", "+", "3", "*"] -> ((2 + 1) * 3) -> 9 ["4", "13", "5", "/", "+"] -> (4 + (13 / 5)) -> 6
Continue reading “LeetCode笔记（5）Evaluate Reverse Polish Notation”
Given a string containing only digits, restore it by returning all possible valid IP address combinations.
For example:
Given"25525511135",return
["255.255.11.135", "255.255.111.35"]. (Order does not matter)
There are two sorted arrays A and B of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)).
Given an array of integers, every element appears three times except for one. Find that single one.
http://oj.leetcode.com/problems/sqrtx/