You are given an integer array values where values[i] represents the value of the ith sightseeing spot. Two sightseeing spots i and j have a distance j - i between them.
The score of a pair (i < j) of sightseeing spots is values[i] + values[j] + i - j: the sum of the values of the sightseeing spots, minus the distance between them.
Return the maximum score of a pair of sightseeing spots.
\n\n\n
Example 1:
\n\n\nInput: values = [8,1,5,2,6]\nOutput: 11\nExplanation: i = 0, j = 2, values[i] + values[j] + i - j = 8 + 5 + 0 - 2 = 11\n\n\n
Example 2:
\n\n\nInput: values = [1,2]\nOutput: 2\n\n\n
\n
Constraints:
\n\n2 <= values.length <= 5 * 1041 <= values[i] <= 1000给你一个正整数数组 values，其中 values[i] 表示第 i 个观光景点的评分，并且两个景点 i 和 j 之间的 距离 为 j - i。
一对景点（i < j）组成的观光组合的得分为 values[i] + values[j] + i - j ，也就是景点的评分之和 减去 它们两者之间的距离。
返回一对观光景点能取得的最高分。
\n\n\n\n
示例 1：
\n\n\n输入：values = [8,1,5,2,6]\n输出：11\n解释：i = 0, j = 2, values[i] + values[j] + i - j = 8 + 5 + 0 - 2 = 11\n\n\n
示例 2：
\n\n\n输入：values = [1,2]\n输出：2\n\n\n
\n\n
提示：
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