View Compilation Error

0_0_13860850_19495.cpp: In function 'void solve()':
0_0_13860850_19495.cpp:11:43: error: 'a' was not declared in this scope
     sort(x+1,x+n+1); long long now=n,ans=(a[n]+a[n-1])%p;
                                           ^
0_0_13860850_19495.cpp:11:56: error: 'p' was not declared in this scope
     sort(x+1,x+n+1); long long now=n,ans=(a[n]+a[n-1])%p;
                                                        ^