Compilare: main.cpp: In function 'void rec(long long unsigned int, long long unsigned int, int)': main.cpp:10:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( size == k ) { ~~~~~^~~~ main.cpp: In function 'int main()': main.cpp:44:21: warning: format '%lu' expects argument of type 'long unsigned int*', but argument 2 has type 'long long unsigned int*' [-Wformat=] scanf("%lu",&n); ^ main.cpp:35:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("caps.in","r",stdin); ^ main.cpp:36:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("caps.out","w",stdout); ^ main.cpp:39:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n",&k,&q); ^ main.cpp:44:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lu",&n); ^