题解（Python）

n,m = map(int, input().split()) 
if m == 0: 
    print(0) 
else: 
    rc = [0] * (n + 1)
    cc = [0] * (n + 1) 
    ps = set() 
    for _ in range(m): 
        x, y = map(int, input().split()) 
        rc[x] += 1 
        cc[y] += 1 
        ps.add((x,  y)) 
    mk = 0 
    for x in range(1, n + 1): 
        for y in range(1, n + 1): 
            c = rc[x] + cc[y] 
            if (x, y) in ps: 
                c -= 1 
            if c>mk: 
                mk=c 
    print(mk) 

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