제출 #466576

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
466576		dattranxxx	경주 (Race) (IOI11_race)	C++11	21 / 100	3076 ms	18484 KiB

race

#include "race.h"
/*
 * Author :  shora
 */
#include <bits/stdc++.h>
#define print(_v) for (auto &_ : _v) {cerr << _ << ' ';} cerr << endl;
using namespace std;
using ll = long long;
const int oo = 1e9;
const int N = 5e5;
struct C {
	int v, w;
	C(int v, int w): v(v), w(w) {}
};
vector<C> G[N];
int dep[N];
int n, k;
int res = oo;
void dfs(int u, int e = -1, int dis = 0) {
	if (k < dis)
		return;
	if (e != -1)
		dep[u] = dep[e] + 1;
	else
		dep[u] = 0;
	if (dis == k) 
		res = min(res, dep[u]);
	for (C& c : G[u]) if (c.v != e) {
		dfs(c.v, u, dis + c.w);
	}
}
int best_path(int n, int K, int H[][2], int L[]) {
	k = K;
	for (int i = 0, u, v, w; i < n-1; ++i) {
		u = H[i][0]; v = H[i][1]; w = L[i];
		G[u].push_back(C(v, w));
		G[v].push_back(C(u, w));
	}
	for (int i = 0; i < n; ++i) 
		dfs(i);	
  return res == oo ? -1 : res;
}

• Subtask 1: 9 / 9
• Subtask 2: 12 / 12
• Subtask 3: 0 / 22
• Subtask 4: 0 / 57