bacan.cpp: In function 'int main()': bacan.cpp:77: warning: comparison between signed and unsigned integer expressions bacan.cpp:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result bacan.cpp:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result bacan.cpp:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result bacan.cpp:22: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result bacan.cpp:18: warning: 'm' may be used uninitialized in this function /tmp/cc0tXJDr.o: In function `main': bacan.cpp:(.text+0xb2): warning: the `gets' function is dangerous and should not be used.