Compilare: user.cpp: In function ‘void dfs(int, int, int)’: user.cpp:32: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void read()’: user.cpp:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:43: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void bfs()’: user.cpp:74: warning: comparison between signed and unsigned integer expressions user.cpp:83: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void back(int)’: user.cpp:105: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void solve()’: user.cpp:119: warning: comparison between signed and unsigned integer expressions