Why doesn't fast I/O in python work for me?

Revision en3, by TomaKapec, 2023-08-01 21:55:17

So I found fast I/O for Python and I used it before and it worked and now it doesn't. I don't know why, I tried everything! I use it for this task https://mirror.codeforces.com/contest/1850/problem/G, and here is my code. If anyone can explain why that would be great. (To clarify the code may be optimal, or maybe not but the question isn't about the task itself but rather about fast input)

import io, os
#so this here should work but doesn't
input = io.BytesIO(os.read(0,os.fstat(0).st_size)).readline
t = int(input())

def solve(n, points):
    d_plus, d_minus, red, stupac = {}, {}, {}, {}
    for i in points:
        x, y = i
        a, b, c, d = red.get(x, 0), stupac.get(y, 0), d_plus.get(x+y, 0), d_minus.get(x-y, 0) 
        r+=(a+b+c+d)*2; red[x], stupac[y], d_plus[x+y], d_minus[x-y] = a+1, b+1, c+1, d+1;

    return r

for i in range(t):
    n = int(input())
    points = [list(map(int, (input().decode()).split())) for i in range(n)]
    print(solve(n, points))


  Rev. Lang. By When Δ Comment
en3 English TomaKapec 2023-08-01 21:55:17 163
en2 English TomaKapec 2023-08-01 18:20:14 49
en1 English TomaKapec 2023-08-01 18:18:25 859 Initial revision (published)