Compilare: main.cpp: In function 'void elim()': main.cpp:14:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<s.length(); i++ ) ~^~~~~~~~~~~ main.cpp: In function 'void rez()': main.cpp:48:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1; i<=s.length(); i++ ) ~^~~~~~~~~~~~