Compilare: main.cpp: In function 'void fn(int, int, int)': main.cpp:33:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < ans . size () ; ++ i){ ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:87:7: warning: unused variable 'x1' [-Wunused-variable] int x1 = a2 , y1 = b2 , z1 = c2; ^~ main.cpp:87:17: warning: unused variable 'y1' [-Wunused-variable] int x1 = a2 , y1 = b2 , z1 = c2; ^~ main.cpp:87:27: warning: unused variable 'z1' [-Wunused-variable] int x1 = a2 , y1 = b2 , z1 = c2; ^~