Compilare: main.cpp: In function 'int main()': main.cpp:59:9: warning: unused variable 'sz' [-Wunused-variable] int sz=prime.size(); ^~ main.cpp:60:13: warning: unused variable 'j' [-Wunused-variable] int n,i,j,a,b; ^ main.cpp:60:15: warning: unused variable 'a' [-Wunused-variable] int n,i,j,a,b; ^ main.cpp:60:17: warning: unused variable 'b' [-Wunused-variable] int n,i,j,a,b; ^