Compilare: main.cpp: In function 'int main()': main.cpp:20:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(!res.empty() && res.size()>=l && res.back()<k) ~~~~~~~~~~^~~ main.cpp:24:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(res.size()>l) ~~~~~~~~~~^~ main.cpp:11:18: warning: variable 'aux' set but not used [-Wunused-but-set-variable] int n, k, l, aux; ^~~