LeetCode-in-All

155. Min Stack

Easy

Design a stack that supports push, pop, top, and retrieving the minimum element in constant time.

Implement the MinStack class:

Example 1:

Input

["MinStack","push","push","push","getMin","pop","top","getMin"]
[[],[-2],[0],[-3],[],[],[],[]]

Output: [null,null,null,null,-3,null,0,-2]

Explanation:

MinStack minStack = new MinStack();
minStack.push(-2);
minStack.push(0);
minStack.push(-3);
minStack.getMin(); // return -3
minStack.pop();
minStack.top(); // return 0
minStack.getMin(); // return -2 

Constraints:

Solution

class MinStack() {
    private val stack: ArrayDeque<Pair<Int, Int>> = ArrayDeque()

    fun push(x: Int) {
        val min: Int = if (stack.isEmpty()) x
        else getMin()
        stack.addLast(x to minOf(min, x))
    }

    fun pop() {
        stack.removeLast()
    }

    fun top(): Int {
        return stack
            .last()
            .first
    }

    fun getMin(): Int {
        return stack
            .last()
            .second
    }
}

/*
 * Your MinStack object will be instantiated and called as such:
 * var obj = MinStack()
 * obj.push(`val`)
 * obj.pop()
 * var param_3 = obj.top()
 * var param_4 = obj.getMin()
 */