Compilare: user.cpp: In function ‘void ReadTree()’: user.cpp:18: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void DFS(int, int)’: user.cpp:30: warning: comparison between signed and unsigned integer expressions user.cpp:27: warning: unused variable ‘y’ user.cpp: In function ‘void RMQ()’: user.cpp:58: warning: suggest parentheses around ‘-’ inside ‘<<’ user.cpp:61: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:63: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result