Compilare: user.cpp: In function ‘long long int rezolva(int)’: user.cpp:11:18: warning: unused variable ‘j’ [-Wunused-variable] int lg,i,x,y,j; ^ user.cpp:14:15: warning: unused variable ‘cs’ [-Wunused-variable] long long cs; ^ user.cpp: In function ‘int main()’: user.cpp:77:17: warning: NULL used in arithmetic [-Wpointer-arith] if(a[i][0]!=NULL) ^ user.cpp:77:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(a[i][0]!=NULL) ^ user.cpp:62:6: warning: unused variable ‘v’ [-Wunused-variable] char v; ^