1752. Check if Array Is Sorted and Rotated

Given an array nums, return true if the array was originally sorted in non-decreasing order, then rotated some number of positions (including zero). Otherwise, return false.

There may be duplicates in the original array.

Note: An array A rotated by x positions results in an array B of the same length such that A[i] == B[(i+x) % A.length], where % is the modulo operation.

class Solution {
public:
    bool check(vector<int>& nums) {
        int ok = 0;
        for(int i = 0, n = nums.size(); i < n and ok <= 1; i++) {
            ok += nums[(i - 1 + n) % n] > nums[i];
        }
        return ok <= 1;
    }
};