unific.cpp: In function 'int main()': unific.cpp:51: warning: comparison between signed and unsigned integer expressions unific.cpp:113: warning: comparison between signed and unsigned integer expressions unific.cpp:116: warning: comparison between signed and unsigned integer expressions unific.cpp:27: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result unific.cpp:28: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result unific.cpp:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result unific.cpp:34: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/ccMKZxPC.o: In function `main': unific.cpp:(.text+0x1af): warning: the `gets' function is dangerous and should not be used.