Compilare: user.cpp: In function ‘int main()’: user.cpp:13:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.length();i++) ^ user.cpp:20:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.length();i++) ^ user.cpp:26:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i;j<s.length();j++) ^ user.cpp:35:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=p;j<s.length();j++) ^ user.cpp:9:11: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] int k,p; ^