Compilare: main.cpp: In function 'int main()': main.cpp:17:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(n - i == m - st.size() - 1) ~~~~~~^~~~~~~~~~~~~~~~~~~~ main.cpp:25:22: 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: 'poz' may be used uninitialized in this function [-Wmaybe-uninitialized] int n, nr, m, poz; ^~~