View Compilation Error

0_0_35695219_16860.cpp: In function 'int main()':
0_0_35695219_16860.cpp:12:16: error: 'a' was not declared in this scope
    scanf("%d",&a[i]);
                ^
0_0_35695219_16860.cpp:14:16: error: 'b' was not declared in this scope
    scanf("%d",&b[i]);
                ^
0_0_35695219_16860.cpp:15:8: error: 'a' was not declared in this scope
   sort(a,a+n,cmp1);
        ^
0_0_35695219_16860.cpp:15:14: error: 'cmp1' was not declared in this scope
   sort(a,a+n,cmp1);
              ^
0_0_35695219_16860.cpp:16:8: error: 'b' was not declared in this scope
   sort(b,b+n,cmp2);
        ^
0_0_35695219_16860.cpp:16:14: error: 'cmp2' was not declared in this scope
   sort(b,b+n,cmp2);
              ^