Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:12:8: warning: variable 'f' set but not used [-Wunused-but-set-variable] bool f = 1; ^ main.cpp: In function 'int main()': main.cpp:40:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("arbore7.in", "r", stdin); ^ main.cpp:41:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("arbore7.out", "w", stdout); ^ main.cpp:44:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:47:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &u, &v); ^