soc.cpp: In function 'int main()': soc.cpp:139: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result soc.cpp:140: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result soc.cpp:142: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result soc.cpp:144: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result soc.cpp:146: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result soc.cpp: In function 'void Reconstitute(TreeNode*)': soc.cpp:122: warning: 'which' may be used uninitialized in this function