Java数据结构优先队列实练

class Solution {
    public int lastStoneWeight(int[] stones) {
        PriorityQueue<Integer> pq = new PriorityQueue<Integer>((a, b) -> b - a);
        for (int stone : stones) {
            pq.offer(stone);
        }
        while (pq.size() > 1) {
            int a = pq.poll();
            int b = pq.poll();
            if (a > b) {
                pq.offer(a - b);
            }
        }
        return pq.isEmpty() ? 0 : pq.poll();
    }
}

class Solution {
    public int fillCups(int[] amount) {
        Arrays.sort(amount);
        int sum=amount[0]+amount[1]+amount[2];
        if(amount[1]+amount[0]>=amount[2]) sum=(sum+1)/2;
        else sum=amount[2];
        return sum;
    }
}

class Solution {
	public int maximumScore(int a, int b, int c) {
		int[] arr = new int[] { a, b, c };
		Arrays.sort(arr);
		a = arr[0];
		b = arr[1];
		c = arr[2];
		if (a + b <= c) {
			return a + b;
		} else {
			return (a + b + c) / 2;
		}
	}
}