func_code_string: #include <bits/stdc++.h>   using namespace std;   vector<int> cities[100000];   vector<bool> visited(100000);   vector<int> t(100000), low(100000);   map<pair<int, int>, int> b;   int c = 0, ans = 0;   void dfs(int v, int p = -1) {     visited[v] = true;     t[v] = low[v] = c++;     for (int dest : cities[v]) {       if (dest == p) continue;       if (visited[dest]) {         low[v] = min(low[v], t[dest]);       } else {         dfs(dest, v);         low[v] = min(low[v], low[dest]);         if (low[dest] > t[v]) {           b[{v, dest}] = 1;           b[{dest, v}] = 1;         } else {           b[{v, dest}] = 0;           b[{dest, v}] = 0;         }       }     }   }   vector<long long> dist(100001);   void Dijkstra(int r, int e) {     set<pair<int, int> > s;     dist[r] = 0;     s.insert({0, r});     while (!s.empty()) {       pair<int, int> p = *s.begin();       s.erase(s.begin());       int x = p.first, y = p.second;       if (x > dist[y]) {         continue;       } else if (dist[e] != INT_MAX) {         return;       }       for (int j = 0; j < cities[y].size(); j++) {         if (dist[y] + b[{y, cities[y][j]}] < dist[cities[y][j]]) {           dist[cities[y][j]] = dist[y] + b[{y, cities[y][j]}];           s.insert({dist[cities[y][j]], cities[y][j]});         }       }     }   }   int main() {     ios::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     int n, m, k;     cin >> n >> m;     for (int i = 0; i < m; i++) {       int x, y;       cin >> x >> y;       cities[x - 1].push_back(y - 1);       cities[y - 1].push_back(x - 1);     }     c = 0;     t.assign(n, -1);     low.assign(n, -1);     visited.assign(n, false);     for (int i = 0; i < n; ++i) {       if (!visited[i]) {         dfs(i);       }     }     cin >> k;     for (int i = 0; i < k; i++) {       ans = 0;       dist.assign(n, INT_MAX);       int root, shop;       cin >> root >> shop;       Dijkstra(root - 1, shop - 1);       cout << dist[shop - 1] <<   n ;     }     return 0;   }   