[Solution] Good Indices solution codechef

Good Indices solution codechef – Chef has an array AA of length NN.

He calls an index ii (1iN)(1≤i≤N) good if there exists some jij≠i such that Ai=AjAi=Aj.

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[Solution] Good Indices solution codechef

Chef can perform the following operation at most once:

  • Choose any subsequence of the array AA and add any positive integer to all the elements of the chosen subsequence.

Determine the maximum number of good indices Chef can get.

Input Format

  • The first line of input will contain a single integer TT, denoting the number of test cases.
  • Each test case consists of two lines of input.
    • The first line of each test case contains a single integer NN denoting the length of the array AA.
    • The second line contains NN space-separated integers denoting the array AA.

Output Format

For each test case, output the maximum number of good indices Chef can get after performing the given operation at most once.

[Solution] Good Indices solution codechef

  • 1T5001≤T≤500
  • 2N10002≤N≤1000
  • 1Ai10001≤Ai≤1000
  • The sum of NN over all test cases won’t exceed 20002000.

Sample Input 1 

1 3 5 2 4 8
2 3 4 5
1 1 2 2 3 4 4

Sample Output 1 


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