compress.cpp: In function 'int main()': compress.cpp:69: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result compress.cpp:70: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result compress.cpp:71: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result compress.cpp: In function 'void rezolva(int&, int&)': compress.cpp:8: warning: 'end' may be used uninitialized in this function /tmp/cc9D8Na0.o: In function `main': compress.cpp:(.text+0x333): warning: the `gets' function is dangerous and should not be used.