docker_space/frontier_cs_7/debug.cpp

#include <bits/stdc++.h>
using namespace std;

int main() {
    int L = 577837, R = 979141;

    struct Edge { int to, w; };
    vector<vector<Edge>> adj;
    int n = 0;
    auto nn = [&]() -> int { adj.emplace_back(); return n++; };

    int END = nn();
    int START = nn();

    map<int,int> fc;
    fc[0] = END;
    function<int(int)> getF = [&](int k) -> int {
        if (fc.count(k)) return fc[k];
        int ch = getF(k-1), u = nn();
        adj[u].push_back({ch, 0});
        adj[u].push_back({ch, 1});
        return fc[k] = u;
    };

    map<tuple<int,int,int>,int> rc;
    vector<tuple<int,int,int>> node_info; // what (k,lo,hi) each node represents
    node_info.resize(2); // END and START
    
    function<int(int,int,int)> gr = [&](int k, int lo, int hi) -> int {
        if (lo > hi) return -1;
        if (k == 0) return (lo == 0 && hi == 0) ? END : -1;
        if (lo == 0 && hi == (1<<k)-1) return getF(k);
        auto key = make_tuple(k, lo, hi);
        auto it = rc.find(key);
        if (it != rc.end()) return it->second;
        int mid = 1 << (k-1);
        int left = -1, right = -1;
        if (lo <= min(hi, mid-1))
            left = gr(k-1, lo, min(hi, mid-1));
        if (max(lo, mid) <= hi)
            right = gr(k-1, max(lo, mid) - mid, hi - mid);
        if (left == -1 && right == -1) return rc[key] = -1;
        int u = nn();
        node_info.resize(n);
        node_info[u] = key;
        if (left != -1) adj[u].push_back({left, 0});
        if (right != -1) adj[u].push_back({right, 1});
        return rc[key] = u;
    };

    int lenL = 32 - __builtin_clz(L), lenR = 32 - __builtin_clz(R);
    for (int len = lenL; len <= lenR; len++) {
        int rs = 1 << (len-1), re = (1<<len)-1;
        int cL = max(L, rs), cR = min(R, re);
        if (cL > cR) continue;
        int target = (len == 1) ? END : gr(len-1, cL - rs, cR - rs);
        if (target != -1) adj[START].push_back({target, 1});
    }

    // Count reachable
    vector<bool> reach(n, false);
    queue<int> q;
    q.push(START); reach[START] = true;
    while (!q.empty()) {
        int u = q.front(); q.pop();
        for (auto& e : adj[u]) {
            if (!reach[e.to]) { reach[e.to] = true; q.push(e.to); }
        }
    }
    
    int cnt = 0;
    for (int i = 0; i < n; i++) if (reach[i]) cnt++;
    cout << "Total reachable nodes: " << cnt << endl;
    
    // Print all range nodes
    cout << "Free chain nodes: ";
    for (auto& [k, id] : fc) cout << "F[" << k << "]=" << id << " ";
    cout << endl;
    
    cout << "Range nodes:" << endl;
    for (auto& [key, id] : rc) {
        auto [k, lo, hi] = key;
        if (reach[id] || id == -1) {
            cout << "  (" << k << ", " << lo << ", " << hi << ") -> node " << id;
            if (id >= 0 && reach[id]) {
                cout << " edges:";
                for (auto& e : adj[id]) cout << " (" << e.to << "," << e.w << ")";
            }
            cout << endl;
        }
    }

    return 0;
}