이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <bits/stdc++.h>
#include "closing.h"
using namespace std;
vector<pair<int, long long>> adj[200005];
long long D[200005][2];
void dfs(int X, int p, int st) {
for(auto u : adj[X]) {
if(u.first == p) continue;
D[u.first][st] = D[X][st] + u.second;
dfs(u.first, X, st);
}
}
int max_score(int N, int X, int Y, long long K,
vector<int> U, vector<int> V, vector<int> W) {
for(int l = 0; l < N; l++) D[l][0] = D[l][1] = 2e18 + 7, adj[l].clear();
for(int l = 0; l < N - 1; l++) {
adj[U[l]].push_back({V[l], W[l]});
adj[V[l]].push_back({U[l], W[l]});
}
if(X > Y) swap(X, Y);
D[X][0] = 0, D[Y][1] = 0;
dfs(X, X, 0); dfs(Y, Y, 1);
int res = 0;
for(int l = X; l >= 0; l--) {
for(int i = X; i < N; i++) {
for(int j = Y; j >= 0; j--) {
for(int e = Y; e < N; e++) {
int lo = max(l, j), hi = min(i, e);
long long calc = 0;
if(lo > hi) {
for(int f = l; f <= i; f++)
calc += D[f][0];
for(int f = j; f <= e; f++)
calc += D[f][1];
}
else {
for(int f = l; f < lo; f++)
calc += D[f][0];
for(int f = lo; f <= hi; f++)
calc += max(D[f][0], D[f][1]);
for(int f = hi + 1; f <= e; f++)
calc += D[f][1];
}
if(calc <= K) res = max(res, i - l + e - j + 2);
}
}
}
}
return res;
}
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