public class Stack { private int[] data; private int size = 0; private int capacity = 100; public Stack() { data = new int[capacity]; } public boolean push(int val) { if(size == capacity) { capacity = size * 2; int[] arr = new int[capacity]; System.arraycopy(data, 0, arr, 0, size); data = arr; } data[size++] = val; return true; } public int pop() { if(size == 0) throw new Exception(“empty stack”); int val = data[size-1]; size--; return val; } public int size() { return size; } }
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