Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:27:15: warning: unused variable ‘sum’ [-Wunused-variable] int pos, v, sum = 0, eliminated = 0; ^ user.cpp:27:24: warning: unused variable ‘eliminated’ [-Wunused-variable] int pos, v, sum = 0, eliminated = 0; ^ user.cpp: In function ‘int main()’: user.cpp:48:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &N); ^ user.cpp:50:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &u, &v); ^ user.cpp:60:38: 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); ^