View Compilation Error

0_0_20359510_23983.cpp: In function 'int main()':
0_0_20359510_23983.cpp:15:3: error: 'll' was not declared in this scope
   ll ans=0;
   ^
0_0_20359510_23983.cpp:18:4: error: 'ans' was not declared in this scope
    ans+=min(a[i],a[i-1]);
    ^
0_0_20359510_23983.cpp:21:3: error: 'ans' was not declared in this scope
   ans+=a[n];
   ^