Compilare: user.cpp: In function ‘long long unsigned int comb(int, int)’: user.cpp:33:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(n2>=k) ^ user.cpp:35:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=n2+1;j<=n;j++) ^ user.cpp:37:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=2;j<=k;j++) ^ user.cpp:43:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=k+1;j<=n;j++) ^ user.cpp: In function ‘int main()’: user.cpp:54:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dezastru.in","r",stdin); ^ user.cpp:55:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dezastru.out","w",stdout); ^ user.cpp:56:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.cpp:58:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i=1;i<=n;i++)scanf("%f",&b[i]); ^