LeetCode - 150. 逆波兰表达式求值 (栈的应用) 题目:150. 逆波兰表达式求值 Description 根据 逆波兰表示法,求表达式的值。 有效的运算符包括 +, -, *, / 。每个运算对象可以是整数,也可以是另一个逆波兰表达式。 整数除法只保留整数部分。 给定逆波兰表达式总是有效的。换句话说,表达式总会得出有效数值且不存在除数为 0
Leetcode 150. Evaluate Reverse Polish Notation Leetcode 224. Basic Calculator II (I, II, III, ...
Input: startTime = [1,2,3,4,6], endTime = [3,5,10,6,9], profit = [20,20,100,70,60] Output: 150 Explanation: The subset chosen is the first, fourth and fifth job. Profit obtained 150 = 20 + 70 + 60. Example 3 Input: startTime = [1,1,1], endTime = [2,3,4], p...
LeetCode 150 Evaluate Reverse Polish Notation Medium Judge whether the current element is '+', '-', '*', '/' first. If not, it's an integer. LeetCode 456 132 Pattern Medium Every time we read one letter, we need to maintain a structure which stores all min-max Interval pairs before...
Binary Tree Postorder Go Hard O(n) O(1) Traversal 150. Evaluate Reverse Polish Go Medium O(n) O(1) Notation 155. Min Stack Go Easy O(n) O(n) 173. Binary Search Tree Iterator Go Medium O(n) O(1) 224. Basic Calculator Go Hard O(n) O(n) 225. Implement Stack using Go Easy...
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再用leetcode75的算法 + (1 + 2 * i) % (n | 1),后者的作用是将前半部分放到奇数位,后半部分放到偶数位。 View Code leetcode 75. Sort Colors 题意: View Code 解法:一次替换的解法。O(n)时间复杂度,初始化两指针 left = 0;right = len - 1; ...
Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. 第一次提交出现变量未定义的编译错误,原因在于对for循环中的循环变量在循环结束后访问其数值以得知循环状态,这种情况下一定要在循环前就定义循环变量,如果在循环内部定义,循环结束后会自动释放。
length() != 0) { 75 operands.push(Long.parseLong(number.toString())); 76 } 77 // for "3+2*2" case that's why we need a while loop 78 while (!operators.isEmpty()) { 79 operands.push(this.calculateValue(operands, operators.pop())); 80 } 81 82 return (int)operands.pop()....
47 75.Sort Colors Medium Given an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order red, white and blue. Here, we will use the integers 0, 1, and 2 to represent the color red, white, and ...