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OI-codes/S2OJ/1026/1026.cpp

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#include <bits/stdc++.h>
using namespace std;
int t, n, u, v;
vector<int> g[100005];
bool flag, vis[100005];
void dfs(int u, int f) {
if (flag) return;
for (int i : g[u]) {
if (i != f) dfs(i, u);
}
if (!vis[u]) {
if (f == -1 || vis[f]) {
flag = true;
} else {
vis[f] = vis[u] = true;
}
}
}
int main() {
cin >> t;
while (t--) {
flag = false;
for (auto& i : g) i.clear();
memset(vis, 0x00, sizeof(vis));
cin >> n;
for (int i = 1; i < n; i++) {
cin >> u >> v;
g[u].push_back(v);
g[v].push_back(u);
}
dfs(1, -1);
cout << (flag ? "Illyasviel" : "Miyu") << endl;
}
return 0;
}