View Compilation Error

0_0_26575579_5166.cpp:1:4: error: 'ans' does not name a type
    ans=0;
    ^
0_0_26575579_5166.cpp:2:12: error: 'sum' was not declared in this scope
    int ave=sum/k;
            ^
0_0_26575579_5166.cpp:2:16: error: 'k' was not declared in this scope
    int ave=sum/k;
                ^
0_0_26575579_5166.cpp:3:4: error: 'll' does not name a type
    ll now=0;
    ^
0_0_26575579_5166.cpp:4:4: error: expected unqualified-id before 'while'
    while(!stk.empty())
    ^