Compilare: user.cpp: In function ‘int main()’: user.cpp:25:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rrmst.in","r",stdin); ^ user.cpp:26:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("rrmst.out","w",stdout); ^ user.cpp:27:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:31:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^ user.cpp:19:16: warning: ‘iy’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (!tata[x]) return x; ^ user.cpp:37:16: note: ‘iy’ was declared here int ix,iy; ^ user.cpp:19:16: warning: ‘ix’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (!tata[x]) return x; ^ user.cpp:37:13: note: ‘ix’ was declared here int ix,iy; ^