Compilare: user.cpp: In function 'int cond(int)': user.cpp:34: warning: comparison between signed and unsigned integer expressions user.cpp:37: warning: suggest parentheses around assignment used as truth value user.cpp: In function 'void bfs(int)': user.cpp:45: warning: unused variable 'i' user.cpp: In function 'int main()': user.cpp:80: warning: comparison between signed and unsigned integer expressions