Envío 879

Código

N = int(input())

M = []

for i in range(N):

    M.append([int(x) for x in input().split()])

results = []
sol = True
sum_diag = 0
sum_anti_diag =  0

for i in range(N):
    
    sum_row = 0
    sum_col = 0
    
    for j in range(N):

        sum_row += M[i][j]
        sum_col += M[j][i]
        
        if j == i:
            sum_diag += M[i][j]
            sum_anti_diag += M[i][N-i-1]

    results.append(sum_row)
    results.append(sum_col)


for el in results:
    if el != sum_diag or el != sum_anti_diag:
        sol = False
        
print("Yes") if sol else print("No")