Compilare: main.cpp: In function 'int main()': main.cpp:30:14: warning: operation on 'lv' may be undefined [-Wsequence-point] f>>v[++lv].x>>v[lv].y>>v[lv].d; ^~~~ main.cpp:33:11: warning: operation on 'lv' may be undefined [-Wsequence-point] v[++lv].x=v[lv-1].x; ^~~~ main.cpp:44:23: warning: suggest parentheses around assignment used as truth value [-Wparentheses] if(v[i].semn=1){ ^