Compilare: main.cpp: In function 'int main()': main.cpp:19:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++) ~^~~~~~~~~ main.cpp:58:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=ind+1;i<s.size();i++) ~^~~~~~~~~ main.cpp:58:23: warning: 'ind' may be used uninitialized in this function [-Wmaybe-uninitialized] for(int i=ind+1;i<s.size();i++) ^