Compilare: user.cpp: In function ‘int nextInt()’: user.cpp:42:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] for (; !isDigit[*head]; ++head); ^ user.cpp:43:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] for (; isDigit[*head]; ++head) ^ user.cpp: At global scope: user.cpp:72:37: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) void putNumber(int x) { ^~~~~~~~~ user.cpp:40:36: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) int nextInt() { ^~~~~~~ user.cpp: In function ‘int main()’: user.cpp:94:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(InFile, "r", stdin); ^ user.cpp:95:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(OuFile, "w", stdout); ^