Compilare: user.cpp: In function ‘int main()’: user.cpp:26:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<s.size();i++) ^ user.cpp:12:22: warning: unused variable ‘l’ [-Wunused-variable] int i,j,nrr,ok,x,l,p; ^ user.cpp:12:24: warning: unused variable ‘p’ [-Wunused-variable] int i,j,nrr,ok,x,l,p; ^