Compilare: user.cpp: In function ‘int main()’: user.cpp:40:32: 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:41:34: 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:43:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:44:13: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(ch); ^ user.cpp:47:17: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(ch); ^ user.cpp:78:15: warning: ‘p4’ may be used uninitialized in this function [-Wmaybe-uninitialized] q[1].p2=p4; ^ user.cpp:77:15: warning: ‘p3’ may be used uninitialized in this function [-Wmaybe-uninitialized] q[1].p1=p3; ^ user.cpp:74:15: warning: ‘p2’ may be used uninitialized in this function [-Wmaybe-uninitialized] q[1].p2=p2; ^ user.cpp:73:15: warning: ‘p1’ may be used uninitialized in this function [-Wmaybe-uninitialized] q[1].p1=p1; ^ /tmp/ccD7eaUx.o: In function `main': user.cpp:(.text.startup+0x72): warning: the `gets' function is dangerous and should not be used.