Compilare: user.cpp: In function ‘void int_el(char*, char, long int&, long int, long int&)’: user.cpp:7:9: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] s[i]=NULL; ^ user.cpp: In function ‘int main()’: user.cpp:34:42: warning: NULL used in arithmetic [-Wpointer-arith] if(solutie[poz_curenta]!=NULL){ ^ user.cpp:21:18: warning: unused variable ‘i’ [-Wunused-variable] long int n,m,i,copie_n,nr_elem=0,nr_pop,poz_curenta=0; ^