codul.cpp: In function 'int main()': codul.cpp:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result codul.cpp:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result codul.cpp:13: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result codul.cpp:17: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result codul.cpp:11: warning: 'i1' may be used uninitialized in this function codul.cpp:11: warning: 'j1' may be used uninitialized in this function /tmp/ccX62X06.o: In function `main': codul.cpp:(.text+0x5d): warning: the `gets' function is dangerous and should not be used.