Compilare: user.cpp: In function ‘int main()’: user.cpp:63:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(v.size()<=k) ^ user.cpp:75:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n&&ans.size()<k;++i) ^ user.cpp:72:9: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] so<<sol<<"\n"; ^