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2115. [Wc2011] Xor
https://hydro.ac/d/bzoj/record/6322efd8bdf9bc31d160a3c0
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BZOJ/2115/2115.cpp
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69
BZOJ/2115/2115.cpp
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#include <iostream>
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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 = 50005;
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int n, m;
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bool vis[N];
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unsigned long long p[N], dep[N], ans;
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std::vector<std::pair<int, unsigned long long>> g[N];
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inline void insert(unsigned long long x) {
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for (int i = 60; ~i; i--) {
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if (x & (1ull << i)) {
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if (p[i]) {
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x ^= p[i];
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} else {
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p[i] = x;
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return;
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}
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}
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}
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}
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void dfs(int u, unsigned long long sum) {
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vis[u] = true;
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dep[u] = sum;
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for (auto e : g[u]) {
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int v = e.first;
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unsigned long long w = e.second;
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if (vis[v]) insert(sum ^ dep[v] ^ w);
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else dfs(v, sum ^ w);
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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 <= m; i++) {
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int s, t;
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unsigned long long d;
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cin >> s >> t >> d;
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g[s].emplace_back(t, d);
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g[t].emplace_back(s, d);
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}
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dfs(1, 0);
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ans = dep[n];
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for (int i = 60; ~i; i--) {
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if ((ans ^ p[i]) > ans) ans ^= p[i];
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}
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cout << ans << endl;
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return 0;
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}
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