Compilare: main.cpp: In function 'void Pref()': main.cpp:32:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<P.size();++i){ ~^~~~~~~~~ main.cpp:30:9: warning: unused variable 'j' [-Wunused-variable] int j=0; ^ main.cpp: In function 'void KMP()': main.cpp:45:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<T.size();++i){ ~^~~~~~~~~ main.cpp:50:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(q==P.size()) a[++k]=i-P.size()+1; ~^~~~~~~~~~