Leetcode 155 Solution

This article provides solution to leetcode question 155 (min-stack)
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https://leetcode.com/problems/min-stack

Solution

class MinStack {
    stack<int> a;
    stack<int> b;

public:
    /** initialize your data structure here. */
    MinStack() {

    }

    void push(int x) {
        int min_val;

        if (b.empty() == false)
            min_val = min(x, b.top());
        else
            min_val = x;

        a.push(x);
        b.push(min_val);
    }

    void pop() {
        a.pop();
        b.pop();
    }

    int top() {
        return a.top();
    }

    int getMin() {
        return b.top();
    }
};

/**
 * Your MinStack object will be instantiated and called as such:
 * MinStack obj = new MinStack();
 * obj.push(x);
 * obj.pop();
 * int param_3 = obj.top();
 * int param_4 = obj.getMin();
 */