View Compilation Error

0_0_39732264_28047.cpp: In function 'int main()':
0_0_39732264_28047.cpp:27:24: error: 'n' was not declared in this scope
   27 |         for(int i=1;i<=n;i++) scanf("%d",&a[i]);
      |                        ^
0_0_39732264_28047.cpp:28:24: error: 'n' was not declared in this scope
   28 |         for(int i=1;i<=n-1;i++){
      |                        ^