Eroare de compilare: user.cpp: In function ‘void DFS_DOWN(int, int, int, int)’: user.cpp:58: warning: operation on ‘L’ may be undefined user.cpp:80: warning: operation on ‘L’ may be undefined user.cpp: In function ‘void DFS_UP(int, int, int)’: user.cpp:117: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void put(int, char)’: user.cpp:190: error: ‘itoa’ was not declared in this scope