Compilare: main.cpp: In function 'int main()': main.cpp:448:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("arboras.out", "w", stdout); ^ main.cpp:450:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp: In member function 'char InParser::read_ch()': main.cpp:14:29: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^ main.cpp: In function 'void dfs(int)': main.cpp:97:3: warning: 'mx' may be used uninitialized in this function [-Wmaybe-uninitialized] if (sz[it.x] > mx) mx = sz[it.x], heavy[nod] = it.x; ^~