Compilare: user.cpp:38:37: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) void unite(int x, int y) ^~~~~ user.cpp:21:36: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) int find(int x) ^~~~ user.cpp:9:36: warning: always_inline function might not be inlinable [-Wattributes] __attribute__((always_inline)) int get_int() ^~~~~~~ user.cpp: In function ‘int main()’: user.cpp:51:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("disjoint.in", "r", stdin); ^ user.cpp:52:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("disjoint.out", "w", stdout); ^ user.cpp:54:37: 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, 1400000, stdin); ^