func_code_string: #include <bits/stdc++.h>   using namespace std;   int ans = -1;   map<pair<int, int>, bool> visited, mp;   void bfs(int x1, int y1, int x2, int y2) {     queue<pair<pair<int, int>, int>> q;     q.push({{x1, y1}, 0});     while (!q.empty()) {       auto z = q.front();       q.pop();       visited[z.first] = 1;       if (z.first.first == x2 && z.first.second == y2) {         ans = z.second;         break;       }       int x = z.first.first, y = z.first.second;       if (x - 1 >= 1 && !visited[{x - 1, y}] && mp[{x - 1, y}]) {         visited[{x - 1, y}] = true;         q.push({{x - 1, y}, z.second + 1});       }       if (x + 1 <= 1e9 && !visited[{x + 1, y}] && mp[{x + 1, y}]) {         visited[{x + 1, y}] = true;         q.push({{x + 1, y}, z.second + 1});       }       if (y - 1 >= 1 && !visited[{x, y - 1}] && mp[{x, y - 1}]) {         visited[{x, y - 1}] = true;         q.push({{x, y - 1}, z.second + 1});       }       if (y + 1 <= 1e9 && !visited[{x, y + 1}] && mp[{x, y + 1}]) {         visited[{x, y + 1}] = true;         q.push({{x, y + 1}, z.second + 1});       }       if (x + 1 <= 1e9 && y + 1 <= 1e9 && !visited[{x + 1, y + 1}] &&           mp[{x + 1, y + 1}]) {         visited[{x + 1, y + 1}] = true;         q.push({{x + 1, y + 1}, z.second + 1});       }       if (x + 1 <= 1e9 && y - 1 >= 1 && !visited[{x + 1, y - 1}] &&           mp[{x + 1, y - 1}]) {         visited[{x + 1, y - 1}] = true;         q.push({{x + 1, y - 1}, z.second + 1});       }       if (x - 1 >= 1 && y + 1 <= 1e9 && !visited[{x - 1, y + 1}] &&           mp[{x - 1, y + 1}]) {         visited[{x - 1, y + 1}] = true;         q.push({{x - 1, y + 1}, z.second + 1});       }       if (x - 1 >= 1 && y - 1 >= 1 && !visited[{x - 1, y - 1}] &&           mp[{x - 1, y - 1}]) {         visited[{x - 1, y - 1}] = true;         q.push({{x - 1, y - 1}, z.second + 1});       }     }   }   int main() {     ;     ios::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     ;     int x1, y1, x2, y2;     cin >> x1 >> y1 >> x2 >> y2;     int n;     cin >> n;     set<pair<int, pair<int, int>>> s;     for (int i = 0; i < n; i++) {       int r, a, b;       cin >> r >> a >> b;       s.insert({r, {a, b}});     }     for (auto it : s) {       for (int i = it.second.first; i <= it.second.second; i++) {         mp[{it.first, i}] = true;       }     }     mp[{x1, y1}] = true;     mp[{x2, y2}] = true;     bfs(x1, y1, x2, y2);     cout << ans;     return 0;   }   