View Compilation Error

0_0_32662072_27769.cpp:11:6: error: expected initializer before 'x'
 LL n x, y;
      ^
0_0_32662072_27769.cpp: In function 'int add(int)':
0_0_32662072_27769.cpp:21:13: error: 'n' was not declared in this scope
  while(x <= n)//往后加就是告诉说有比你小的出现了 
             ^
0_0_32662072_27769.cpp: In function 'int main()':
0_0_32662072_27769.cpp:47:30: error: 'n' was not declared in this scope
  while(scanf("%lld%lld%lld",&n,&x,&y) != EOF)
                              ^
0_0_32662072_27769.cpp:47:33: error: 'x' was not declared in this scope
  while(scanf("%lld%lld%lld",&n,&x,&y) != EOF)
                                 ^
0_0_32662072_27769.cpp:47:36: error: 'y' was not declared in this scope
  while(scanf("%lld%lld%lld",&n,&x,&y) != EOF)
                                    ^