func_code_string: #include <bits/stdc++.h>   using namespace std;   int main(int argc, char **argv) {     int n, k, value = 0;     vector<pair<int, int>> set;     cin >> n >> k;     for (int i = 0; i < n; ++i) {       int x, y;       cin >> x >> y;       set.push_back({x, y});     }     for (int i = 0; i < n; ++i) {       value += set[i].second - set[i].first + 1;     }     if (value % k == 0) {       cout << 0;       return 0;     }     cout << k - (value % k);   }   