def check_arr(arr, result = 5): arr.sort() #[-50, -4, 1, 2, 4, 5, 5, 9, 23, 23, 40, 42] for i in arr: #-50 + x = 5 #x = 5 - (-50) #binary search for x return arr = [1 ,2 , 9 , 4 ,5 ,5, -50, 40, -4, 42 ,23 ,2 3]