Compilare: main.cpp:24:15: warning: multi-character character constant [-Wmultichar] if (ch == '-1') { ^~~~ main.cpp:38:37: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) void write(unsigned int x) { ^~~~~ main.cpp: In function 'char Advance()': main.cpp:14:34: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, SIZE, stdin); ^ main.cpp: In function 'int main()': main.cpp:99:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("vmin.in", "r", stdin); ^ main.cpp:100:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("vmin.out", "w", stdout); ^