dist.cpp: In function 'int main()': dist.cpp:39: warning: unused variable 'n' dist.cpp:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result dist.cpp:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result dist.cpp:40: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result dist.cpp:56: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result /tmp/cc2qVI1A.o: In function `main': dist.cpp:(.text+0x1eb): warning: the `gets' function is dangerous and should not be used.