mess.cpp: In function 'void read(int&)': mess.cpp:24: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result mess.cpp:32: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result mess.cpp: In function 'void AIBUpdate(Node, int, int)': mess.cpp:91: warning: statement has no effect mess.cpp: In function 'int AIBQuery(Node, int)': mess.cpp:96: warning: statement has no effect mess.cpp: In function 'int main()': mess.cpp:133: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result mess.cpp:134: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result mess.cpp:136: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result mess.cpp: In function 'int BinarySearch(Node, int, int)': mess.cpp:74: warning: 'answer' may be used uninitialized in this function mess.cpp: In function 'int main()': mess.cpp:135: warning: 'answer' may be used uninitialized in this function