题目：
题解：
class Solution {public int maxRotateFunction(int[] nums) {int f = 0, n = nums.length, numSum = Arrays.stream(nums).sum();for (int i = 0; i < n; i++) {f += i * nums[i];}int res = f;for (int i = n - 1; i > 0; i--) {f += numSum - n * nums[i];res = Math.max(res, f);}return res;}
}
