Compilare: user.cpp: In function ‘void ReadInput()’: user.cpp:48:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:51:49: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int u, v, d; scanf("%d%d%d", &u, &v, &d); ^ user.cpp:57:57: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &times[i].first, &times[i].second); ^ user.cpp: In function ‘void DFS(int, int, int, int, int)’: user.cpp:85:40: warning: ‘where’ may be used uninitialized in this function [-Wmaybe-uninitialized] int left = begin, right = end, where; ^