Compilare: user.cpp: In function ‘int main()’: user.cpp:44:23: warning: suggest parentheses around comparison in operand of ‘==’ [-Wparentheses] if(a[j].dx==a[j+1].dx==a[j+2].dx&&a[j].dy==a[j+1].dy==a[j+2].dy) ^ user.cpp:44:54: warning: suggest parentheses around comparison in operand of ‘==’ [-Wparentheses] if(a[j].dx==a[j+1].dx==a[j+2].dx&&a[j].dy==a[j+1].dy==a[j+2].dy) ^