Compilare: user.cpp: In function ‘int main()’: user.cpp:42:250: warning: operation on ‘matrix[a][(b + 1)]’ may be undefined [-Wsequence-point] matrix[a][b] = matrix[a+1][b] = matrix[a-1][b] = matrix[a][b+1] = matrix[a][b-1] = matrix[a+2][b] = matrix[max(a-2,0)][b] = matrix[a][b+1] = matrix[a][max(b-2,0)] = matrix[a+1][b+1]= matrix[a+1][b-1]=matrix[a-1][b+1]=matrix[a-1][b-1]= -1; ^