Compilare: user.cpp: In function ‘int get_int2()’: user.cpp:43:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(; !isDigit[*head]; ++head); ^ user.cpp:45:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(; isDigit[*head]; ++head) ^ user.cpp: At global scope: user.cpp:52:45: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) unsigned int get_int() ^~~~~~~ user.cpp:39:36: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) int get_int2() ^~~~~~~~ user.cpp: In function ‘unsigned int get_int()’: user.cpp:60:24: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] ++p == 0x20000 && (fread(inBuffer, 0x1, 0x20000, stdin), p = 0x0); ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.cpp:67:24: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] ++p == 0x20000 && (fread(inBuffer, 0x1, 0x20000, stdin), p = 0x0); ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:108:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bfs.in", "r", stdin); ^ user.cpp:109:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("bfs.out", "w", stdout); ^