Compilare: user.cpp: In function ‘void CountingSort(int, int*, int*, int)’: user.cpp:10:41: warning: operation on ‘i’ may be undefined [-Wsequence-point] for(int i = 0x0; i != 0xFFFF; index[++i] = index[~-i] + frequence[~-i]); ^~~ user.cpp:10:41: warning: operation on ‘i’ may be undefined [-Wsequence-point] user.cpp: At global scope: user.cpp:40:37: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) void put_number(int x) ^~~~~~~~~~ user.cpp:15:36: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) int get_number() ^~~~~~~~~~ user.cpp:4:37: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) void CountingSort(int N, int A[], int B[], int digit) ^~~~~~~~~~~~ user.cpp: In function ‘int get_number()’: user.cpp:23:23: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] ++p == 0x8000 && (fread(inBuffer, 0x1, 0x8000, stdin), p = 0x0); ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.cpp:30:23: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] ++p == 0x8000 && (fread(inBuffer, 0x1, 0x8000, stdin), p = 0x0); ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:62:38: 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:63:40: 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); ^