Compilare: user.cpp: In function ‘void CountingSort(unsigned int, unsigned int*, unsigned int*, unsigned int)’: user.cpp:9:49: warning: operation on ‘i’ may be undefined [-Wsequence-point] for(unsigned int i = 0x0; i != 0x7FF; index[++i] = index[~-i] + frequence[~-i]); ^~~ user.cpp:9:49: warning: operation on ‘i’ may be undefined [-Wsequence-point] user.cpp: At global scope: user.cpp:34:37: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) void put_number(unsigned int x) ^~~~~~~~~~ user.cpp:14:45: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) unsigned int get_number() ^~~~~~~~~~ user.cpp:3:37: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) void CountingSort(unsigned int N, unsigned int A[], unsigned int B[], unsigned int 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); ^