palc.cpp: In function 'int main()': palc.cpp:18: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result palc.cpp:19: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result palc.cpp:21: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/ccyp7Ffb.o: In function `main': palc.cpp:(.text+0xe9): warning: the `gets' function is dangerous and should not be used.