Compilare: user.cpp: In function ‘int main()’: user.cpp:54:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2; i<=n; i++) ^ user.cpp:63:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<=n; i++) ^ user.cpp:68:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<=n; i++) ^ user.cpp:76:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<=n; i++) ^ user.cpp:82:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1; i<=n; i++)if(i%10 == 1)cout<<v[i]<<" "; ^ user.cpp:42:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("radixsort.in","r",stdin); ^ user.cpp:43:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("radixsort.out","w",stdout); ^