Compilare: main.cpp: In function 'int cifre(int)': main.cpp:21:10: warning: statement has no effect [-Wunused-value] for(i;nr;nr-=(nr&(-nr)), ++i); ^ main.cpp: In function 'int main()': main.cpp:43:13: warning: unused variable 'l' [-Wunused-variable] int l = 1; ^ main.cpp:27:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("margele.in","r",stdin); ^ main.cpp:28:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("margele.out","w",stdout); ^ main.cpp:30:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &n,&k,&a,&b); ^