Compilare: user.cpp: In function ‘int main()’: user.cpp:188:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= nr; i ++) ^ user.cpp:196:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= nr; i ++) ^ user.cpp:203:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= nr; i ++) ^ user.cpp:164:32: warning: unused variable ‘k’ [-Wunused-variable] unsigned long long nr = 0, k = 0, fr[11] = {0}, D = 1; ^