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S2OJ/1497/1497.cpp Normal file
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#include <iostream>
#include <chrono>
#include <map>
#include <random>
#include <set>
#include <vector>
using std::cin;
using std::cout;
const char endl = '\n';
const int N = 1e6 + 5;
int n, m, a, b, ans;
unsigned long long sum[N];
std::vector<std::pair<int, unsigned long long>> g[N];
std::map<int, unsigned long long> map;
std::set<unsigned long long> set;
void dfs(int u, int f, unsigned long long s) {
sum[u] = sum[f] ^ s;
for (auto e : g[u]) {
int v = e.first;
unsigned long long w = e.second;
if (v == f) continue;
dfs(v, u, w);
}
}
signed main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
std::mt19937_64 rand(std::chrono::system_clock::now().time_since_epoch().count());
cin >> n >> m;
for (int i = 1; i < n; i++) {
int u, v, w;
cin >> u >> v >> w;
if (!map.count(w)) map[w] = rand();
set.insert(map[w]);
g[u].emplace_back(v, map[w]);
g[v].emplace_back(u, map[w]);
}
dfs(1, 0, 0);
cin >> a >> b;
while (m--) {
int x = a % n + 1,
y = b % n + 1;
unsigned long long s = sum[x] ^ sum[y];
if (s == 0 || set.count(s)) ans++;
a = static_cast<long long>(a) * 666073 % 1000000007;
b = static_cast<long long>(b) * 233 % 998244353;
}
cout << ans << endl;
return 0;
}

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S2OJ/1498/1498.cpp Normal file
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#include <iostream>
#include <cstring>
#include <deque>
#include <set>
#include <vector>
using std::cin;
using std::cout;
const char endl = '\n';
const int N = 1000005;
int n, m, id[N], last[N], dist[N];
bool vis[N];
std::set<int> cs;
std::vector<std::pair<int, int>> c[N], g[N];
void bfs() {
memset(dist, 0x3f, sizeof(dist));
std::deque<int> q;
dist[1] = 0;
q.emplace_back(1);
while (!q.empty()) {
int u = q.front();
q.pop_front();
if (vis[u]) continue;
vis[u] = true;
for (auto e : g[u]) {
int v = e.first,
w = e.second;
if (dist[v] > dist[u] + w) {
dist[v] = dist[u] + w;
if (w) q.emplace_back(v);
else q.emplace_front(v);
}
}
}
}
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
cin >> n >> m;
for (int i = 1, u, v, c; i <= m; i++) {
cin >> u >> v >> c;
::c[c].emplace_back(u, v);
cs.insert(c);
}
int cnt = n;
for (int x : cs) {
for (auto e : c[x]) {
int u = e.first,
v = e.second;
if (last[u] != x) {
last[u] = x;
id[u] = ++cnt;
g[u].emplace_back(id[u], 1);
g[id[u]].emplace_back(u, 0);
}
if (last[v] != x) {
last[v] = x;
id[v] = ++cnt;
g[v].emplace_back(id[v], 1);
g[id[v]].emplace_back(v, 0);
}
g[id[u]].emplace_back(id[v], 0);
g[id[v]].emplace_back(id[u], 0);
}
}
bfs();
cout << (dist[n] == 0x3f3f3f3f ? -1 : dist[n]) << endl;
return 0;
}

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