Compilare: user.cpp: In function ‘void calcpref(int)’: user.cpp:11:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<s[x].size();i++) ^ user.cpp: In function ‘void kmp(int)’: user.cpp:22:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<str.size();i++) ^ user.cpp:28:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(k==s[x].size()-1) ^