View Compilation Error

0_0_13134499_5794.cpp: In function 'int main()':
0_0_13134499_5794.cpp:4:26: error: conflicting declaration 'int a [5000]'
  int n,i,j,a,b,t,s,a[5000]; 
                          ^
0_0_13134499_5794.cpp:4:12: note: previous declaration as 'int a'
  int n,i,j,a,b,t,s,a[5000]; 
            ^
0_0_13134499_5794.cpp:21:6: error: invalid types 'int[int]' for array subscript
   a[n]=t;
      ^
0_0_13134499_5794.cpp:25:20: error: invalid types 'int[int]' for array subscript
   printf("%d\n",a[n]);
                    ^