Compilare: main.cpp: In function 'void rez()': main.cpp:12:17: warning: NULL used in arithmetic [-Wpointer-arith] if (s[poz]!=NULL) ^~~~ main.cpp: In function 'int main()': main.cpp:64:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i<st.size() && j<dr.size()) ~^~~~~~~~~~ main.cpp:64:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i<st.size() && j<dr.size()) ~^~~~~~~~~~ main.cpp:74:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (st[i]==st[i+1] && i+1<st.size()) ~~~^~~~~~~~~~ main.cpp:76:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (dr[j]==dr[j+1] && j+1<dr.size()) ~~~^~~~~~~~~~