Compilare: main.cpp: In function 'std::vector<long long int> f(std::vector<long long int>)': main.cpp:22:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size(); i++) ~~^~~~~~~~~~ main.cpp: In function 'void dfs(long long int, long long int)': main.cpp:57:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i <= k && i < cnt.size(); i++) ~~^~~~~~~~~~~~ main.cpp: At global scope: main.cpp:102:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] main() ^