maxq.cpp: In function 'void update_nod(long long int)': maxq.cpp:17: warning: unused variable 'sum' maxq.cpp: In function 'int main()': maxq.cpp:83: warning: unused variable 'j' maxq.cpp:81: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result maxq.cpp:82: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result maxq.cpp:84: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result maxq.cpp:86: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result maxq.cpp:88: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result maxq.cpp:91: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result