Compilare: user.cpp: In function ‘int get(int, int)’: user.cpp:87: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:103: warning: unused variable ‘j’ user.cpp:106: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:107: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result user.cpp: In function ‘void DFS(int)’: user.cpp:29: warning: ‘son’ may be used uninitialized in this function