Compilare: user.cpp: In function ‘int main()’: user.cpp:16:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=k;i<=(strlen(s)-k)/2;i++){ ~^~~~~~~~~~~~~~~~~ user.cpp:9:13: warning: unused variable ‘nrl’ [-Wunused-variable] int nrl,i=1,nr,k=0,sum=0,j,aux; ^~~ user.cpp:13:22: warning: ‘aux’ may be used uninitialized in this function [-Wmaybe-uninitialized] while(aux>0){ ~~~^~