Compilare: main.cpp: In function 'int main()': main.cpp:53:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=x;i++) ~^~~ main.cpp:58:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2;i<=x;i++) ~^~~ main.cpp:69:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=x;i++) ~^~~ main.cpp:33:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("xnumere.in","r",stdin); ^ main.cpp:34:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("xnumere.out","w",stdout); ^ main.cpp:37:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld%lld",&k,&x,&n); ^