算法1 一维数组的动态和_具体的一维数组动态和

class Solution {
    private int [] forSolution(int[] nums){
        int[] result = new int[nums.length];
        result[0] = nums[0];
        for (int i = 1; i < nums.length; i++) {
            result[i] = result[i - 1] +  nums[i];
        }
        return result;
    }
     private int [] queueSolution(int[] nums){
        int[] result = new int[nums.length];
        ArrayQueue queue = ArrayQueue.createQueue(nums.length);
        try {
                queue.enQueue(nums[0]);
                for(int i=1; i < nums.length; i++) {
                    int enQueueNum = queue.peek()+ nums[i];
                    queue.enQueue(enQueueNum);
                }
                int index = 0;
                while(!queue.isEmpty()){
                    result[index] = queue.deQueue();
                    index++;
                }
        } catch(Exception e) {
            // do nothing
        }
        return result;
    }

    public int[] runningSum(int[] nums){
        // return forSolution(nums);
        return queueSolution(nums);
    }
}

class ArrayQueue {
    private int front;
    private int rear;
    private int capacity;
    private int [] array;

    private ArrayQueue(int size){
        capacity = size;
        front = -1;
        rear = -1;
        array = new int [size];
    }
    public static ArrayQueue createQueue(int size) {
        return new ArrayQueue(size);
    }
    public boolean isEmpty(){
        return (front == -1);
    }
    public boolean isFull() {
        return ((rear + 1) % capacity == front);
    }
    public int getQueueSize(){
        return ((capacity - front + rear + 1) % capacity);
    }
    public void enQueue(int data) throws Exception {
        if(isFull()) throw new Exception("Queue overflow");
        rear = (rear + 1) % capacity;
        array[rear] = data;
        if(front == -1) front = rear;
    }
    public int deQueue() throws Exception  {
        int data;
        if(isEmpty()) throw new Exception("Queue Empty");
        data = array[front];
        if(front == rear){
            front = rear - 1;
        }else {
            front = (front + 1) % capacity;
        }
        return data;
    }
    public int peek() throws Exception  {
        int data;
        if(isEmpty()) throw new Exception("Queue Empty");
        data = array[rear];
        return data;
    }
}

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