Compilare: main.cpp: In function 'int main()': main.cpp:19:9: warning: statement has no effect [-Wunused-value] in>>n>>s; ~~~~~^~~ main.cpp:21:18: warning: statement has no effect [-Wunused-value] in>>v[i].x>>v[i].y; ~~~~~~~~~~^~~~~~~~ main.cpp:18:12: warning: unused variable 'j' [-Wunused-variable] int n,i,j,s,in,s1=1; ^ main.cpp:20:13: warning: 'n' is used uninitialized in this function [-Wuninitialized] for(i=1;i<=n;i++) ~^~~ main.cpp:22:6: warning: 's' is used uninitialized in this function [-Wuninitialized] in=s/n; ~~^~~~