Compilare: user.cpp: In function ‘int main()’: user.cpp:50:147: warning: statement has no effect [-Wunused-value] if( part[ c ][ d ] - part[ a - 1 ][ d ] - part[ c - 1 ][ b ] + part[ a - 1 ][ b - 1 ] == ( c - a + 1 ) * ( d - b + 1 ) ) stop == 0; ^