Compilare: user.cpp: In function ‘void RadixSort(unsigned int*, unsigned int, unsigned int)’: user.cpp:12:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = begin; i != end; ++i) ^ user.cpp: In function ‘int main()’: user.cpp:56:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < N; ++i) ^ user.cpp:63:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < N; i += 10) ^ user.cpp:49:40: 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:50:42: 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); ^ user.cpp:52:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &N, &A, &B, &C); ^