Compilare: user.cpp: In function ‘void Precomp()’: user.cpp:49:39: warning: operation on ‘pos[a[i]]’ may be undefined [-Wsequence-point] nxt[pos[a[i]]] = pos[a[i]] = i; ^ user.cpp: In function ‘void Read()’: user.cpp:28:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:33:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i]); ^ user.cpp:35:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &q[i].L, &q[i].R); ^