retea.cpp: In function 'void Solve()': retea.cpp:47: warning: comparison between signed and unsigned integer expressions retea.cpp:54: warning: comparison between signed and unsigned integer expressions retea.cpp:56: warning: comparison between signed and unsigned integer expressions retea.cpp: In function 'void DFS(int)': retea.cpp:65: warning: comparison between signed and unsigned integer expressions retea.cpp: In function 'void DFS2(int)': retea.cpp:75: warning: comparison between signed and unsigned integer expressions