View Compilation Error

0_0_38455820_16043.cpp: In function 'void solve()':
0_0_38455820_16043.cpp:32:3: error: 'll' was not declared in this scope
   ll sum = 0;
   ^
0_0_38455820_16043.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_38455820_16043.cpp:35:7: error: 'sum' was not declared in this scope
   if (sum < k) {
       ^