smin.cpp: In function 'int main()': smin.cpp:28: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result smin.cpp:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result smin.cpp: In function 'void Gen(int, int)': smin.cpp:52: warning: suggest parentheses around comparison in operand of '|' smin.cpp: In function 'void ReadData()': smin.cpp:97: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result smin.cpp:100: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result