View Compilation Error

0_0_16089414_9420.cpp: In function 'int main()':
0_0_16089414_9420.cpp:15:44: error: 'a' was not declared in this scope
   for (int i = 1; i <= n; i++) scanf("%d", a + i), a[i]++;
                                            ^
0_0_16089414_9420.cpp:16:44: error: 'b' was not declared in this scope
   for (int i = 1; i <= n; i++) scanf("%d", b + i), b[i]++;
                                            ^