Compilare: main.cpp: In function 'void f(std::vector<long long int>&, long long int)': main.cpp:24:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size(); i ++) ~~^~~~~~~~~~ main.cpp:45:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size(); i ++) ~~^~~~~~~~~~ main.cpp:47:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size(); i ++) ~~^~~~~~~~~~ main.cpp: In function 'long long int u(long long int)': main.cpp:62:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v3.size(); i ++) ~~^~~~~~~~~~~ main.cpp: In function 'int32_t main()': main.cpp:123:9: warning: unused variable 'cn' [-Wunused-variable] int cn = n; ^~