Pseudo Sorted Array Codechef Solution
An array AA of length NN is said to be pseudo-sorted if it can be made non-decreasing after performing the following operation at most once.
- Choose an ii such that 1≤i≤N−11≤i≤N−1 and swap AiAi and Ai+1Ai+1
Given an array AA, determine if it is pseudo-sorted or not.
- The first line contains a single integer TT – the number of test cases. Then the test cases follow.
- The first line of each test case contains an integer NN – the size of the array AA.
- The second line of each test case contains NN space-separated integers A1,A2,…,ANA1,A2,…,AN denoting the array AA.
For each testcase, output
YES if the array AA is pseudo-sorted,
You may print each character of
NO in uppercase or lowercase (for example,
Yes will be considered identical).
- Sum of NN over all test cases do not exceed 2⋅1052⋅105
Sample Input 1
3 5 7 8 9
1 3 2 3
3 2 1
Sample Output 1
Test case 1: The array is already sorted in non-decreasing order.
Test case 2: We can choose i=2i=2 and swap A2A2 and A3A3. The resulting array will be [1,2,3,3][1,2,3,3], which is sorted in non-decreasing order.
Test case 3: It can be proven that the array cannot be sorted in non-decreasing order in at most one operation.
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