View Compilation Error

0_0_15149191_19692.cpp:7:7: error: expected initializer before 'a'
 }bian a[21000]; int len,last[110];
       ^
0_0_15149191_19692.cpp: In function 'void ins(int, int, int)':
0_0_15149191_19692.cpp:11:2: error: 'a' was not declared in this scope
  a[len].x=x; a[len].y=y; a[len].d=d;
  ^
0_0_15149191_19692.cpp: In function 'int main()':
0_0_15149191_19692.cpp:40:26: error: 'a' was not declared in this scope
    for(int k=last[x];k;k=a[k].next)
                          ^