View Compilation Error

0_0_39098161_6651.cpp: In function 'void solve()':
0_0_39098161_6651.cpp:7:12: error: 'l' was not declared in this scope
    7 |     while (l <= r) {
      |            ^
0_0_39098161_6651.cpp:7:17: error: 'r' was not declared in this scope
    7 |     while (l <= r) {
      |                 ^
0_0_39098161_6651.cpp:8:26: error: 'i' has not been declared
    8 |         auto check = [&](i mid) {
      |                          ^
0_0_39098161_6651.cpp: In lambda function:
0_0_39098161_6651.cpp:11:33: error: 'a' was not declared in this scope
   11 |                 while (i < r && a[r] + a[i] > mid) {
      |                                 ^
0_0_39098161_6651.cpp:14:17: error: 'cnt' was not declared in this scope; did you mean 'int'?
   14 |                 cnt += r - i;
      |                 ^~~
      |                 int
0_0_39098161_6651.cpp:16:20: error: 'cnt' was not declared in this scope; did you mean 'int'?
   16 |             return cnt >= k;
      |                    ^~~
      |                    int
0_0_39098161_6651.cpp:16:27: error: 'k' was not declared in this scope
   16 |             return cnt >= k;
      |                           ^