Compilare: user.cpp: In function ‘void Dfs(int)’: user.cpp:25: warning: comparison between signed and unsigned integer expressions user.cpp:45: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void DfsComp(int)’: user.cpp:58: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void DfsSortTop(int)’: user.cpp:67: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void DfsSortTop2(int)’: user.cpp:78: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void solve()’: user.cpp:102: warning: comparison between signed and unsigned integer expressions user.cpp:103: warning: comparison between signed and unsigned integer expressions