Compilare: user.cpp: In function ‘int main()’: user.cpp:30:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<strlen(p);i++) ^ user.cpp:36:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(p);i++) ^ user.cpp:49:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=strlen(s)-strlen(p)+1;i++) ^