Compilare: user.cpp: In function ‘int main()’: user.cpp:143: warning: comparison between signed and unsigned integer expressions user.cpp:130: warning: unused variable ‘x’ user.cpp:137: warning: unused variable ‘lo’ user.cpp:137: warning: unused variable ‘hi’ user.cpp:118: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:119: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:122: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:126: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:131: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:133: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:142: warning: ‘bst2’ may be used uninitialized in this function