Package g1301_1400.s1381_design_a_stack_with_increment_operation

Class CustomStack

java.lang.Object
g1301_1400.s1381_design_a_stack_with_increment_operation.CustomStack
public class CustomStack extends Object
1381 - Design a Stack With Increment Operation\. Medium Design a stack which supports the following operations. Implement the `CustomStack` class: * `CustomStack(int maxSize)` Initializes the object with `maxSize` which is the maximum number of elements in the stack or do nothing if the stack reached the `maxSize`. * `void push(int x)` Adds `x` to the top of the stack if the stack hasn't reached the `maxSize`. * `int pop()` Pops and returns the top of stack or **\-1** if the stack is empty. * `void inc(int k, int val)` Increments the bottom `k` elements of the stack by `val`. If there are less than `k` elements in the stack, just increment all the elements in the stack. **Example 1:** **Input** ["CustomStack","push","push","pop","push","push","push","increment","increment","pop","pop","pop","pop"] [[3],[1],[2],[],[2],[3],[4],[5,100],[2,100],[],[],[],[]] **Output:** [null,null,null,2,null,null,null,null,null,103,202,201,-1] **Explanation:** CustomStack customStack = new CustomStack(3); // Stack is Empty [] customStack.push(1); // stack becomes [1] customStack.push(2); // stack becomes [1, 2] customStack.pop(); // return 2 --> Return top of the stack 2, stack becomes [1] customStack.push(2); // stack becomes [1, 2] customStack.push(3); // stack becomes [1, 2, 3] customStack.push(4); // stack still [1, 2, 3], Don't add another elements as size is 4 customStack.increment(5, 100); // stack becomes [101, 102, 103] customStack.increment(2, 100); // stack becomes [201, 202, 103] customStack.pop(); // return 103 --> Return top of the stack 103, stack becomes [201, 202] customStack.pop(); // return 202 --> Return top of the stack 102, stack becomes [201] customStack.pop(); // return 201 --> Return top of the stack 101, stack becomes [] customStack.pop(); // return -1 --> Stack is empty return -1. **Constraints:** * `1 <= maxSize <= 1000` * `1 <= x <= 1000` * `1 <= k <= 1000` * `0 <= val <= 100` * At most `1000` calls will be made to each method of `increment`, `push` and `pop` each separately.

  • Constructor Details

    • CustomStack

      public CustomStack(int maxSize)

  • Method Details

    • push

      public void push(int x)

    • pop

      public int pop()

    • increment

      public void increment(int k, int val)