Compilare: user.cpp: In function ‘int main()’: user.cpp:36:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=8;i<s.length();i++) ^ user.cpp:14:10: warning: unused variable ‘ch’ [-Wunused-variable] char ch; ^ user.cpp:32:17: warning: ‘c1’ may be used uninitialized in this function [-Wmaybe-uninitialized] c1++; ^ user.cpp:70:10: warning: ‘keep’ may be used uninitialized in this function [-Wmaybe-uninitialized] else if(keep==0&&c1%2==1) ^