Compilare: main.cpp: In function 'int main()': main.cpp:59:33: warning: suggest parentheses around '&&' within '||' [-Wparentheses] else if( dx[y] == dx[i] and dy[i] == 0 || dx[y] == dy[i] and dx[i] == 0 ) nr++; ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~ main.cpp:65:33: warning: suggest parentheses around '&&' within '||' [-Wparentheses] else if( dx[y] == dx[i] and dy[i] == 0 || dx[y] == dy[i] and dx[i] == 0 ) g<<i<<" "; ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~