Compilare: main.cpp: In function 'bool checkIfLeaf(int)': main.cpp:114:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int fi = 0 ; fi < G[node].size() ; ++ fi) { ~~~^~~~~~~~~~~~~~~~ main.cpp:115:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int se = fi + 1 ; se < G[node].size() ; ++ se) { ~~~^~~~~~~~~~~~~~~~ main.cpp: In member function 'void InputReader<T>::advance() [with T = int]': main.cpp:25:4: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread (buffer, SIZE, 1, input_file) ; ^~~~~ main.cpp: In constructor 'InputReader<T>::InputReader(const char*) [with T = int]': main.cpp:33:3: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread (buffer, SIZE, 1, input_file) ; ^~~~~