Pair sort

def pair_sort():
    n = int(input())
    arr = list(map(int, input().split()))

    swap_index_list = []

    for i in range(0, 2*n, 2):
        if arr[i] == arr[i + 1]:
            continue         
        for j in range(i+2, 2*n):
            if arr[j] == arr[i]:
                arr[i+1], arr[j] = arr[j], arr[i+1]
                swap_index_list.append([i+2, j+1])
                break

    print(len(swap_index_list))
    for swap in swap_index_list:
        print(swap[0], swap[1])
 
if __name__ == "__main__":
    pair_sort()

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED