Created
April 17, 2022 07:30
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Min stack [https://leetcode.com/problems/min-stack]
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| var MinStack = function() { | |
| this.stack = [] | |
| this.historyStack = []; | |
| }; | |
| /** | |
| * @param {number} val | |
| * @return {void} | |
| */ | |
| MinStack.prototype.push = function(val) { | |
| this.stack.push(val); | |
| const currentLocalMin = this.getMin(); | |
| const historyMin = val !== undefined && currentLocalMin > val || currentLocalMin === undefined | |
| ? val | |
| : currentLocalMin; | |
| this.historyStack.push(historyMin); | |
| }; | |
| /** | |
| * @return {void} | |
| */ | |
| MinStack.prototype.pop = function() { | |
| this.stack.pop(); | |
| this.historyStack.pop(); | |
| }; | |
| /** | |
| * @return {number} | |
| */ | |
| MinStack.prototype.top = function() { | |
| return this.stack[this.stack.length - 1]; | |
| }; | |
| /** | |
| * @return {number} | |
| */ | |
| MinStack.prototype.getMin = function() { | |
| return this.historyStack[this.historyStack.length - 1]; | |
| }; |
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