Today when my brother was trying to solve 1355B - Young Explorers with Python3. He got wrong answer on Test 10.

81011086

81011086 May/23/2020 13:44UTC+2 ThetaSigma B — Young Explorers Python 3 Wrong answer on test 10

When he told me about his solution, I thought about it for a bit and I couldn't come up with anything. So I just tried submitting it with PyPy3 and weirdly enough it got accepted.

81011123

81011123 May/23/2020 13:45UTC+2 ThetaSigma B — Young Explorers PyPy 3 Accepted

For anyone curious, here's the code:

from sys import stdin

def inp():
    return stdin.readline().strip()

t = int(inp())
for _ in range(t):
    n = int(inp())
    e = [int(x) for x in inp().split()]
    e.sort()
    x = list(set(e))
    big = max(e)
    results = {}
    for i in e:
        if results.get(i,0):
            results[i] += 1
        else:
            results[i] = 1
    groups = 0
    counter = 1
    for i, j in results.items():
        groups += j//i
        if i != big:
            results[x[counter]] += j%i
        counter += 1

    print(groups)

Does anyone have any idea about what's happening here?