View Compilation Error

0_0_13638633_28541.cpp: In function 'int main()':
0_0_13638633_28541.cpp:15:13: error: 'b' was not declared in this scope
             b[i] = a[i];
             ^
0_0_13638633_28541.cpp:17:14: error: 'b' was not declared in this scope
         sort(b+1, b+1+n);
              ^