hash tables: ice cream parlor c++ code example

Example: hackerrank ice cream parlor

# you require like no knowledge of topics like 
# enumerate, binary search, sorted

n = int(input())

for _ in range(n):
    m = int(input())
    arrn = int(input())
    arr = list(map(int, input().split()))
    for i in range(len(arr)):
        for j in range(i, len(arr)):
            if arr[i] + arr[j] == m:
                if i != j:
                    print(i+1, j+1)
                    break
# after going through various concepts
# i coded out this simple soulution which was the easiest thing
# and realized that it was quite easy than i thought