View Compilation Error

0_0_28940462_16854.cpp: In function 'int main()':
0_0_28940462_16854.cpp:16:3: error: 'ans' was not declared in this scope
   ans=0;
   ^
0_0_28940462_16854.cpp:22:17: error: 'sort' was not declared in this scope
   sort(a+1,a+1+p);
                 ^