Compilare: user.cpp: In function ‘int main()’: user.cpp:36:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j<s.size()){ ^ user.cpp:11:42: warning: unused variable ‘ok’ [-Wunused-variable] int semn=1,valx=0,valnum=0,nrc=0,ok=0; ^