Envío 910

Código

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