Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:11:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<s.size();i++) ^ user.cpp:13:9: error: ‘j’ was not declared in this scope j++; ^ user.cpp:16:16: error: ‘j’ was not declared in this scope if(j!=0) ^ user.cpp:20:13: error: ‘j’ was not declared in this scope j=0; ^