mirror of
https://git.sb/baoshuo/OI-codes.git
synced 2024-12-25 18:32:00 +00:00
219 lines
4.0 KiB
C++
219 lines
4.0 KiB
C++
#include <iostream>
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#include <algorithm>
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#include <iterator>
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#include <map>
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#include <stack>
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#include <utility>
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#include <vector>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 2e5 + 5;
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int n, m, q;
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int cnt = 1, edge_cnt;
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std::map<int, int> map[N];
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std::vector<std::pair<int, int>> qs[N];
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std::vector<int> ans;
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struct edge {
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int l, r, x, y, w;
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edge(const int &_x = 0,
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const int &_y = 0,
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const int &_l = 0,
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const int &_w = 0)
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: l(_l), r(0), x(_x), y(_y), w(_w) {}
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} edges[N << 1];
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struct dsu_item {
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int f, w, s;
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dsu_item(const int &_f = 0, const int &_w = 0)
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: f(_f), w(_w), s(1) {}
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} dsu[N];
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struct seg_node : std::vector<edge> {
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int l, r;
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seg_node(const int &_l = 0,
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const int &_r = 0,
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const std::vector<edge> &_v = std::vector<edge>())
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: std::vector<edge>(_v), l(_l), r(_r) {}
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} tr[N << 2];
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class liner_base {
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private:
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int b[31];
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public:
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void insert(int w) {
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for (int i = 29; i >= 0; --i) {
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if (!(w >> i)) continue;
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if (!b[i]) {
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b[i] = w;
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break;
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}
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w ^= b[i];
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}
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}
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int query(int w) {
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for (int i = 29; i >= 0; --i) {
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if (!((w >> i) & 1)) continue;
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w ^= b[i];
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}
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return w;
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}
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} lb[std::__lg(N << 2) + 1];
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int find(int x, int &w) {
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while (x != dsu[x].f) {
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w ^= dsu[x].w;
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x = dsu[x].f;
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}
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return x;
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}
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void merge(int x, int y, int w, int d) {
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if (x == y) {
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lb[d].insert(w);
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return;
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}
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if (dsu[x].s < dsu[y].s) std::swap(x, y);
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dsu[y].f = x;
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dsu[y].w = w;
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dsu[x].s += dsu[y].s;
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}
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int query(int x, int y, int d) {
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int w = 0;
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x = find(x, w);
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y = find(y, w);
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if (x != y) return -1;
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return lb[d].query(w);
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}
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void build(int u, int l, int r) {
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tr[u] = seg_node(l, r);
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if (l == r) return;
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int mid = (l + r) >> 1;
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build(u << 1, l, mid);
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build(u << 1 | 1, mid + 1, r);
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}
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void insert(int u, const edge &e) {
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if (e.l <= tr[u].l && tr[u].r <= e.r) {
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tr[u].emplace_back(e);
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return;
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}
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int mid = (tr[u].l + tr[u].r) >> 1;
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if (e.l <= mid) insert(u << 1, e);
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if (e.r > mid) insert(u << 1 | 1, e);
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}
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void solve(int u, int l, int r, int d) {
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std::stack<std::pair<int, dsu_item>> st;
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lb[d] = lb[d - 1];
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for (auto e : tr[u]) {
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int wx = 0, wy = 0;
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int x = find(e.x, wx);
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int y = find(e.y, wy);
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st.emplace(x, dsu[x]);
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st.emplace(y, dsu[y]);
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merge(x, y, wx ^ wy ^ e.w, d);
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}
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if (l == r) {
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for (auto o : qs[l]) {
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ans.emplace_back(query(o.first, o.second, d));
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}
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} else {
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int mid = (l + r) >> 1;
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solve(u << 1, l, mid, d + 1);
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solve(u << 1 | 1, mid + 1, r, d + 1);
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}
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while (!st.empty()) {
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dsu[st.top().first] = st.top().second;
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st.pop();
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}
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}
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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cin >> n >> m;
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for (int i = 1; i <= n; i++) {
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dsu[i] = dsu_item(i, 0);
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}
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for (int i = 1, x, y, d; i <= m; i++) {
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cin >> x >> y >> d;
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map[x][y] = map[y][x] = ++edge_cnt;
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edges[edge_cnt] = edge(x, y, 1, d);
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}
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cin >> q;
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for (int i = 1, op, x, y; i <= q; i++) {
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cin >> op >> x >> y;
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if (op == 1) {
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int d;
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cin >> d;
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map[x][y] = map[y][x] = ++edge_cnt;
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edges[edge_cnt] = edge(x, y, ++cnt, d);
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} else if (op == 2) {
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edges[map[x][y]].r = cnt++;
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} else { // op == 3
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qs[cnt].emplace_back(x, y);
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}
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}
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build(1, 1, cnt);
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for (int i = 1; i <= edge_cnt; i++) {
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if (!edges[i].r) edges[i].r = cnt;
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insert(1, edges[i]);
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}
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solve(1, 1, cnt, 1);
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std::copy(ans.begin(), ans.end(), std::ostream_iterator<int>(cout, "\n"));
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return 0;
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}
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