Compilare: user.cpp: In function ‘int intersection(int, int&, int)’: user.cpp:38:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i==v.size()-1) ^ user.cpp: In function ‘int main()’: user.cpp:78:11: warning: unused variable ‘x’ [-Wunused-variable] int n,x,y,iright,ileft,st,dr,maxx,minx; ^ user.cpp:78:13: warning: unused variable ‘y’ [-Wunused-variable] int n,x,y,iright,ileft,st,dr,maxx,minx; ^