不知道为啥，之前还能46pts，现在直接保龄了

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

const int maxn = 2e5 + 10;
int n, m, q, fa[maxn];
bool vis[maxn][2];
vector<int> g[maxn];

int getfa(int x) {
    if (fa[x] == x) return x;
    return fa[x] = getfa(fa[x]);
}

void dfs(int u, int w) {
    vis[u][w] = true;
    for (int v : g[u]) {
        if (!vis[v][w ^ 1]) dfs(v, w ^ 1);
    }
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);
    cin >> n >> m >> q;
    for (int i = 1; i <= n; i++) fa[i] = i;
    for (int i = 1; i <= m; i++) {
        int u, v;
        cin >> u >> v;
        g[u].push_back(v);
        g[v].push_back(u);
        fa[getfa(u)] = getfa(v);
    }
    for (int i = 1; i <= n; i++) {
        if (!vis[i][0] && !vis[i][1]) dfs(i, 0);
    }
    while (q--) {
        int s, t, x;
        cin >> s >> t >> x;
        if (s == t) {
            if (x == 0) {
                cout << "tribool\n";
            } else if (x % 2 == 1 && (vis[s][0] || vis[s][1])) {
                cout << "tribool\n";
            } else {
                cout << "expand\n";
            }
        } else if (getfa(s) == getfa(t)) {
            if ((x & 1) == 1 && (vis[s][1] && vis[t][0] || vis[s][0] && vis[t][1])) {
                cout << "tribool\n";
            } else if ((x & 1) == 0 && (vis[s][1] && vis[t][1] || vis[s][0] && vis[t][0])) {
                cout << "tribool\n";
            } else {
                cout << "expand\n";
            }
        } else {
            cout << "expand\n";
        }
    }
    return 0;
}

救救孩子吧，谁有代码啊