Envío 903

Código

N = int(input())
M = [[int(n) for n in input().split()] for _ in range(N)]
want = sum(M[0])
for idx, row in enumerate(M):
    sum_row = sum_col = sum_D1 = sum_D2 = 0
    for i in range(N):
        sum_row = sum(row)
        sum_col += M[i][idx]
        sum_D1 += M[i][i]
        sum_D2 += M[i][N-i-1]
    if want != sum_row or want != sum_col or want != sum_D1 or want != sum_D2:
            print("No")
            break
else:
    print("Yes")