subperm.cpp:12: warning: 'typedef' was ignored in this declaration subperm.cpp: In function 'int calc(int)': subperm.cpp:40: warning: comparison between signed and unsigned integer expressions subperm.cpp:52: warning: comparison between signed and unsigned integer expressions subperm.cpp: In function 'int main()': subperm.cpp:66: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result subperm.cpp:67: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result subperm.cpp:69: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result subperm.cpp:71: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result