View Compilation Error

0_0_39037685_10471.cpp: In function 'int main()':
0_0_39037685_10471.cpp:31:64: error: too few arguments to function 'LL dx(int, int)'
   31 |             while (l < r && dy(q[l + 1], q[l]) <= 2 * s[i] * dx(q[l + 1] - q[l])) l++;
      |                                                              ~~^~~~~~~~~~~~~~~~~
0_0_39037685_10471.cpp:17:4: note: declared here
   17 | LL dx(int u1, int u2) {
      |    ^~