Compilare: user.cpp: In function ‘void dfs_st(int)’: user.cpp:18: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void dfs_dr(int)’: user.cpp:29: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:71: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:72: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:73: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:76: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result