Compilare: user.cpp: In function `void sorttop(int)': user.cpp:54: warning: comparison between signed and unsigned integer expressions user.cpp: In function `void dfs(int)': user.cpp:64: warning: comparison between signed and unsigned integer expressions user.cpp: In function `int main()': user.cpp:81: warning: comparison between signed and unsigned integer expressions user.cpp:84: warning: comparison between signed and unsigned integer expressions