运行 ID: 102145

Main.cc:10:6: error: expected initializer before ‘a’
 node a[100001];
      ^
Main.cc: In function ‘int main()’:
Main.cc:22:10: error: ‘a’ was not declared in this scope
   cin >> a[i].x;
          ^
Main.cc:25:7: error: ‘a’ was not declared in this scope
  sort(a+1 ,a+n+1 ,cmp);
       ^