human
Can you provide a Python code to calculate the minimum possible x given the following:
Dora loves adventures quite a lot. During some journey she encountered an amazing city, which is formed by n streets along the Eastern direction and m streets across the Southern direction. Naturally, this city has nm intersections. At any intersection of i-th Eastern street and j-th Southern street there is a monumental skyscraper. Dora instantly became curious and decided to explore the heights of the city buildings.

When Dora passes through the intersection of the i-th Eastern and j-th Southern street she examines those two streets. After Dora learns the heights of all the skyscrapers on those two streets she wonders: how one should reassign heights to the skyscrapers on those two streets, so that the maximum height would be as small as possible and the result of comparing the heights of any two skyscrapers on one street wouldn't change.

Formally, on every of nm intersections Dora solves an independent problem. She sees n + m - 1 skyscrapers and for each of them she knows its real height. Moreover, any two heights can be compared to get a result "greater", "smaller" or "equal". Now Dora wants to select some integer x and assign every skyscraper a height from 1 to x. When assigning heights, Dora wants to preserve the relative order of the skyscrapers in both streets. That is, the result of any comparison of heights of two skyscrapers in the current Eastern street shouldn't change and the result of any comparison of heights of two skyscrapers in current Southern street shouldn't change as well. Note that skyscrapers located on the Southern street are not compared with skyscrapers located on the Eastern street only. However, the skyscraper located at the streets intersection can be compared with both Southern and Eastern skyscrapers. For every intersection Dora wants to independently calculate the minimum possible x.

For example, if the intersection and the two streets corresponding to it look as follows:


Then it is optimal to replace the heights of the skyscrapers as follows (note that all...
The above is tricky. Write me a correct solution in PYTHON3.
assistant
#Here is Python code to calculate the minimum possible x.

import os
import sys
from io import BytesIO, IOBase
from collections import defaultdict, deque, Counter, OrderedDict
import threading

def main():
    n,m = map(int,input().split())
    a = [[*map(int,input().split())] for _ in range(n)]
    col = [defaultdict(lambda:0) for _ in range(m)] #열
    row = [defaultdict(lambda:0) for _ in range(n)] #행
    col_num = [0]*m
    row_num = [0]*n
    ans = [[0]*m for _ in range(n)]
    for i in range(n):
        D = set()
        for j in range(m):
            D.add(a[i][j])
        D = sorted(list(D))
        z = 1
        for x in D:
            if row[i][x] == 0: row[i][x] = z; z+=1
        row_num[i] = z-1
    for j in range(m):
        D = set()
        for i in range(n):
            D.add(a[i][j])
        D = sorted(list(D))
        z = 1
        for x in D:
            if col[j][x] == 0: col[j][x] = z; z+=1
        col_num[j] = z-1
    for i in range(n):
        for j in range(m):
            z = abs(row[i][a[i][j]] - col[j][a[i][j]])
            if row[i][a[i][j]] >= col[j][a[i][j]]:
                ans[i][j] = max(row_num[i],col_num[j]+z)
            else:
                ans[i][j] = max(col_num[j],row_num[i]+z)
    for i in range(n):
        print(*ans[i])


BUFSIZE = 8192

class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
        ...