Compilare: user.cpp: In function ‘int main()’: user.cpp:15:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<n;i++) ~^~ user.cpp:17:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<l;i++) ~^~ user.cpp:25:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<l+d;i++) ~^~~~ user.cpp:27:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<l+d;j++) ~^~~~ user.cpp:35:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h=0;h<l+d;h++) ~^~~~ user.cpp:47:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int h=0;h<l+d;h++) ~^~~~ user.cpp:10:30: warning: unused variable ‘a’ [-Wunused-variable] unsigned long long int n,a,b,l=2; ^ user.cpp:10:32: warning: unused variable ‘b’ [-Wunused-variable] unsigned long long int n,a,b,l=2; ^