View Compilation Error

0_0_18438089_26355.cpp: In function 'int main()':
0_0_18438089_26355.cpp:41:13: error: 'a' was not declared in this scope
 scanf("%d",&a[j]);
             ^
0_0_18438089_26355.cpp:43:13: error: 'b' was not declared in this scope
 scanf("%d",&b[j]);
             ^
0_0_18438089_26355.cpp:46:36: error: invalid use of void expression
 printf("Case #%d: %d %d\n",i,find());
                                    ^