Compilare: user.cpp: In function ‘int main()’: user.cpp:44:20: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] else if(v[i].y<=vicx||v[i].x>=vicy) if(v[i].x!=v[i].y)S=S+vicy-vicx, vicx=v[i].x,vicy=v[i].y; ^ user.cpp:49:11: warning: ‘S’ may be used uninitialized in this function [-Wmaybe-uninitialized] cout<<S<<'\n'; ^