Compilare: user.cpp: In function ‘void CountingSort(size_t, size_t*, size_t*, size_t)’: user.cpp:9:47: warning: operation on ‘i’ may be undefined [-Wsequence-point] for(size_t i = 0x0; i != 0x7FF; frequence[++i] += frequence[~-i]); ^~~ user.cpp:11:44: warning: operation on ‘i’ may be undefined [-Wsequence-point] for(size_t i = N; i; ) B[--frequence[A[--i] >> digit & 0x7FF]] = A[i]; ^~~ user.cpp:5:32: warning: variable ‘index’ set but not used [-Wunused-but-set-variable] size_t frequence[0x800]{}, index[0x800]; index[0x0] = ~0x0; ^~~~~ user.cpp: At global scope: user.cpp:34:37: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) void put_number(size_t x) ^~~~~~~~~~ user.cpp:14:39: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) size_t get_number() ^~~~~~~~~~ user.cpp:3:37: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) void CountingSort(size_t N, size_t A[], size_t B[], size_t digit) ^~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:56:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algsort.in", "r", stdin); ^ user.cpp:57:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("algsort.out", "w", stdout); ^