Compilare: user.cpp: In function ‘void build_automaton()’: user.cpp:16:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i<strlen(a)) ~^~~~~~~~~~ user.cpp: In function ‘int kmp()’: user.cpp:39:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < strlen(b)) ~~^~~~~~~~~~~ user.cpp:46:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j == strlen(a)) ~~^~~~~~~~~~~~ user.cpp:52:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(i < strlen(b) && a[j] != b[i]) ~~^~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:65:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<pos_holder.size();i++) ~^~~~~~~~~~~~~~~~~~