Compilare: main.cpp: In function 'int main()': main.cpp:22:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(stiva.size() < nr) ~~~~~~~~~~~~~^~~~ main.cpp:24:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(stiva.size() == nr) ~~~~~~~~~~~~~^~~~~ main.cpp:13:9: warning: unused variable 'p' [-Wunused-variable] int p = n - k; ^