3max.cpp: In function 'int main()': 3max.cpp:78: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result 3max.cpp:79: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result 3max.cpp:81: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result 3max.cpp:83: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result 3max.cpp:107: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result