View Compilation Error

0_0_38455818_9774.cpp: In function 'bool check(long long int)':
0_0_38455818_9774.cpp:21:2: error: 'll' was not declared in this scope
  ll sum = 0;
  ^
0_0_38455818_9774.cpp:25:3: error: 'sum' was not declared in this scope
   sum += query(l, r);
   ^
0_0_38455818_9774.cpp:27:9: error: 'sum' was not declared in this scope
  return sum >= k;
         ^
0_0_38455818_9774.cpp: In function 'void solve()':
0_0_38455818_9774.cpp:32:3: error: 'll' was not declared in this scope
   ll sum = 0;
   ^
0_0_38455818_9774.cpp:33:45: error: 'sum' was not declared in this scope
   for (int i = 1; i <= n; i++) cin >> a[i], sum += a[i];
                                             ^
0_0_38455818_9774.cpp:35:7: error: 'sum' was not declared in this scope
   if (sum < k) {
       ^