Compilare: user.cpp: In function ‘void CountingSort(size_t, size_t*, size_t*, size_t)’: user.cpp:9:43: warning: operation on ‘i’ may be undefined [-Wsequence-point] for(size_t i = 0x0; i != 0x7FF; index[++i] = index[~-i] + frequence[~-i]); ^~~ user.cpp:9:43: warning: operation on ‘i’ may be undefined [-Wsequence-point] user.cpp: At global scope: user.cpp:37:37: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) void put_number(size_t x) ^~~~~~~~~~ user.cpp:16:37: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) void get_number(size_t &num) ^~~~~~~~~~ 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 ‘void get_number(size_t&)’: user.cpp:24:21: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] ++p != SIZE || (fread(inBuffer, 0x1, SIZE, stdin), p = 0x0); ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.cpp:31:21: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] ++p != SIZE || (fread(inBuffer, 0x1, SIZE, stdin), p = 0x0); ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:59:38: 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:60:40: 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); ^