Compilare: main.cpp: In function 'int main()': main.cpp:25:114: warning: suggest parentheses around comparison in operand of '==' [-Wparentheses] if(v(a[i],a[j],b[i])*v(a[i],b[j],b[i])<=0 && v(b[j],a[i],a[j])*v(b[j],b[i],a[j])<=0 && (a[i].x*b[i].y==a[i].y*b[i].x==0 && a[i].x*a[j].y==a[i].y*a[j].x !=0)) ~~~~~~~~~~~~~^~~~~~~~~~~~~~~ main.cpp:25:149: warning: suggest parentheses around comparison in operand of '!=' [-Wparentheses] if(v(a[i],a[j],b[i])*v(a[i],b[j],b[i])<=0 && v(b[j],a[i],a[j])*v(b[j],b[i],a[j])<=0 && (a[i].x*b[i].y==a[i].y*b[i].x==0 && a[i].x*a[j].y==a[i].y*a[j].x !=0)) ~~~~~~~~~~~~~^~~~~~~~~~~~~~~