Compilare: user.cpp: In function ‘int main()’: user.cpp:20:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rj.in","r",stdin); ^ user.cpp:21:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rj.out","w",stdout); ^ user.cpp:24:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n",&n,&m); ^ user.cpp:27:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(c); ^ user.cpp:72:15: warning: ‘cj’ may be used uninitialized in this function [-Wmaybe-uninitialized] tata2.y=cj; ^ user.cpp:71:15: warning: ‘lj’ may be used uninitialized in this function [-Wmaybe-uninitialized] tata2.x=lj; ^ user.cpp:53:14: warning: ‘cr’ may be used uninitialized in this function [-Wmaybe-uninitialized] tata.y=cr; ^ user.cpp:52:14: warning: ‘lr’ may be used uninitialized in this function [-Wmaybe-uninitialized] tata.x=lr; ^ /tmp/cc6PgA7t.o: In function `main': user.cpp:(.text.startup+0x88): warning: the `gets' function is dangerous and should not be used.