// #pragma GCC optimize("O3,Ofast,unroll-loops")
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#include <bits/stdc++.h>
using namespace std;
#define lli long long int
#define MP make_pair
#define pb push_back
#define REP(i,n) for(int i = 0; (i) < (n); (i)++)
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
void fastio() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
}
const double EPS = 0.00001;
const int INF = 1e9+500;
const int N = 1e6 + 5;
const int ALPH = 26;
const int LGN = 25;
constexpr int MOD = 1e9+7;
int n,t,m;
vector<int> dp(N, 0);
vector<vector<int> > adj(N, vector<int>());
void dfs(int node, int par) {
for(auto c : adj[node]) {
if(c == par) continue;
dfs(c, node);
}
array<int, 2> mx = {0, 0};
for(auto c : adj[node]) {
if(c == par) continue;
if(dp[c] > mx[0]) {
swap(mx[0], mx[1]);
mx[0] = dp[c];
}
else if(dp[c] > mx[1]) {
mx[1] = dp[c];
}
}
dp[node] = mx[1];
}
inline void solve() {
cin>>n>>t>>m;
REP(i, n - 1) {
int u, v;
cin >> u >> v;
adj[u].pb(v);
adj[v].pb(u);
}
dfs(m, t);
cout << dp[m] << "\n";
}
signed main() {
fastio();
int test = 1;
//cin>>test;
while(test--) {
solve();
}
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
9 ms |
27740 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
212 ms |
72532 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
9 ms |
27740 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Incorrect |
9 ms |
27740 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |