Compilare: user.cpp: In function ‘int main()’: user.cpp:13:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<b.size();i++) ^ user.cpp:16:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (a[j]==b[i+j] && j<a.size() && i+j<b.size()) j++; ^ user.cpp:16:57: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (a[j]==b[i+j] && j<a.size() && i+j<b.size()) j++; ^ user.cpp:17:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j==a.size()) p[++k]=i; ^