Compilare: main.cpp: In function 'int main()': main.cpp:23:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<b.size();++i) ~^~~~~~~~~ main.cpp:48:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<next_pos.size();++i) ~^~~~~~~~~~~~~~~~ main.cpp:51:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<b.size();++j) ~^~~~~~~~~ main.cpp:69:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<st.size();++j) ~^~~~~~~~~~ main.cpp:71:21: warning: 'curr_last_pos' may be used uninitialized in this function [-Wmaybe-uninitialized] last_pos=curr_last_pos+1; ~~~~~~~~^~~~~~~~~~~~~~~~