Compilare: main.cpp: In function 'int main()': main.cpp:16:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (!st.empty() && st.size() - 1 + (n - i) >= m && st.top() < s[i]) ~~~~~~~~~~~~~~~~~~~~~~~~^~~~ main.cpp:20:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(st.size() < m) ~~~~~~~~~~^~~ main.cpp:11:12: warning: unused variable 'nr' [-Wunused-variable] int n, nr, m, poz; ^~ main.cpp:11:19: warning: unused variable 'poz' [-Wunused-variable] int n, nr, m, poz; ^~~