func_code_string: #include <bits/stdc++.h>   using namespace std;   int a[100007], b[100007];   vector<int> v, ans;   int main() {     ios_base::sync_with_stdio(0);     cin.tie(0);     int n, m, x;     cin >> n >> m;     for (int i = 0; i < n; i++) cin >> x, a[x]++;     for (int i = 0; i < n; i++) cin >> x, b[m - x - 1]++;     for (int x = 0; x < 2 * m; x++) {       int i = x % m;       while (a[i]) v.push_back(i), a[i]--;       while (b[i] && v.size())         ans.push_back((v.back() + m - i - 1) % m), v.pop_back(), b[i]--;     }     sort(ans.begin(), ans.end());     for (long i = ans.size() - 1; i >= 0; i--) cout << ans[i] <<    ;   }   