Compilare: user.cpp: In function ‘void Dfs(int, int)’: user.cpp:22: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘bool BFS()’: user.cpp:45: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void solve()’: user.cpp:64: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void write()’: user.cpp:119: warning: comparison between signed and unsigned integer expressions