rj.cpp: In function 'void fs(int, int, int)': rj.cpp:14: warning: unused variable 'j' rj.cpp: In function 'void fs1(int, int, int)': rj.cpp:42: warning: unused variable 'j' rj.cpp: In function 'int main()': rj.cpp:84: warning: unused variable 'ch' rj.cpp:82: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result rj.cpp:83: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result rj.cpp:85: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result rj.cpp:88: warning: ignoring return value of 'char* gets(char*)', declared with attribute warn_unused_result rj.cpp:84: warning: 'lr' may be used uninitialized in this function rj.cpp:84: warning: 'cr' may be used uninitialized in this function rj.cpp:84: warning: 'lj' may be used uninitialized in this function rj.cpp:84: warning: 'cj' may be used uninitialized in this function /tmp/ccostIh2.o: In function `main': rj.cpp:(.text+0x2d8): warning: the `gets' function is dangerous and should not be used.