Compilare: user.cpp: In function ‘void dfs(int, int*)’: user.cpp:28:9: warning: unused variable ‘cc’ [-Wunused-variable] int cc = 0; ^ user.cpp: In function ‘int main()’: user.cpp:48:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &m); ^ user.cpp:52:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &x, &y); ^