Compilare: user.cpp: In function ‘void CountingSort(size_t, size_t*, size_t*, size_t)’: user.cpp:10:43: warning: operation on ‘i’ may be undefined [-Wsequence-point] for(size_t i = 0x0; i != 0x7FF; index[++i] = index[~-i] + frequence[~-i]); ^~~ user.cpp:10:43: warning: operation on ‘i’ may be undefined [-Wsequence-point] user.cpp: In function ‘size_t get_int()’: user.cpp:32:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(; !isDigit[*head]; ++head); ^ user.cpp:34:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(; isDigit[*head]; ++head) ^ user.cpp: At global scope: user.cpp:41:37: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) void put_int(size_t x) ^~~~~~~ user.cpp:28:39: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) size_t get_int() ^~~~~~~ user.cpp:4:37: 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:73:38: 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:74:40: 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); ^