Design-a-Stack-With-Increment-Operation.java

class CustomStack {
    int[] stack;
    public int top=-1;
    public CustomStack(int maxSize) {
        stack=new int[maxSize];
    }
    
    public void push(int x) {
        if(top<stack.length-1)
        {
            stack[++top]=x;
        }
    }
    
    public int pop() {
        if(top==-1)
            return -1;
        top--;
        return stack[top+1];
    }
    
    public void increment(int k, int val) {
        for(int i=0;i<(k>top+1?top+1:k);i++) {
            stack[i]+=val;
        }
    }
}

/**
 * Your CustomStack object will be instantiated and called as such:
 * CustomStack obj = new CustomStack(maxSize);
 * obj.push(x);
 * int param_2 = obj.pop();
 * obj.increment(k,val);
 */