結果

問題 No.1308 ジャンプビーコン
ユーザー 沙耶花沙耶花
提出日時 2020-12-05 14:31:02
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 928 ms / 4,000 ms
コード長 1,602 bytes
コンパイル時間 2,664 ms
コンパイル使用メモリ 208,972 KB
最終ジャッジ日時 2025-01-16 17:49:24
ジャッジサーバーID
(参考情報)
judge4 / judge3
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 3
other AC * 37
権限があれば一括ダウンロードができます
コンパイルメッセージ
main.cpp:13:33: warning: use of ‘auto’ in parameter declaration only available with ‘-std=c++20’ or ‘-fconcepts’
   13 | vector<long long> get(int start,auto &E){
      |                                 ^~~~
main.cpp:34:10: warning: use of ‘auto’ in parameter declaration only available with ‘-std=c++20’ or ‘-fconcepts’
   34 | void dfs(auto &E,auto &dp,auto &ndp,auto &dis,int now,int F,int P,int p=-1){
      |          ^~~~
main.cpp:34:18: warning: use of ‘auto’ in parameter declaration only available with ‘-std=c++20’ or ‘-fconcepts’
   34 | void dfs(auto &E,auto &dp,auto &ndp,auto &dis,int now,int F,int P,int p=-1){
      |                  ^~~~
main.cpp:34:27: warning: use of ‘auto’ in parameter declaration only available with ‘-std=c++20’ or ‘-fconcepts’
   34 | void dfs(auto &E,auto &dp,auto &ndp,auto &dis,int now,int F,int P,int p=-1){
      |                           ^~~~
main.cpp:34:37: warning: use of ‘auto’ in parameter declaration only available with ‘-std=c++20’ or ‘-fconcepts’
   34 | void dfs(auto &E,auto &dp,auto &ndp,auto &dis,int now,int F,int P,int p=-1){
      |                                     ^~~~
main.cpp: In function ‘int main()’:
main.cpp:56:22: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   56 |                 scanf("%d %d %d",&u,&v,&l);
      |                 ~~~~~^~~~~~~~~~~~~~~~~~~~~
main.cpp:65:22: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   65 |                 scanf("%d",&x[i]);
      |                 ~~~~~^~~~~~~~~~~~

ソースコード

diff #

#pragma target("avx2")
#pragma optimize("O3")
#pragma optimize("unroll-loops")

#include <stdio.h>
#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 100000000000000000



vector<long long> get(int start,auto &E){
	vector<long long> dis(E.size(),Inf);
	dis[start] = 0;
	queue<int> Q;
	Q.push(start);
	
	while(Q.size()>0){
		int u = Q.front();
		Q.pop();
		rep(i,E[u].size()){
			int v = E[u][i].first;
			if(dis[v]!=Inf)continue;
			dis[v] = dis[u] + E[u][i].second;
			Q.push(v);
		}
	}
	
	return dis;
}

long long C;
void dfs(auto &E,auto &dp,auto &ndp,auto &dis,int now,int F,int P,int p=-1){
	
	if(F!=now)ndp[now] = min(ndp[now],dp[now] + C + dis[now][P]);
	else ndp[now] = min(ndp[now],dp[now] + dis[now][P]);
	
	rep(i,E[now].size()){
		int to = E[now][i].first;
		if(to==p)continue;
		dfs(E,dp,ndp,dis,to,F,P,now);
		ndp[now] = min(ndp[now],ndp[to]);
	}
}

int main(){
	
	int N,Q;
	
	cin>>N>>Q>>C;
	
	vector E(N,vector<pair<int,long long>>());
	rep(i,N-1){
		int u,v,l;
		scanf("%d %d %d",&u,&v,&l);
		
		u--;v--;
		E[u].emplace_back(v,l);
		E[v].emplace_back(u,l);
	}
	
	vector<int> x(Q);
	rep(i,Q){
		scanf("%d",&x[i]);
		x[i]--;
	}
	
	vector dis(N,vector<long long>());
	
	rep(i,N){
		dis[i] = get(i,E);
	}
	
	vector<long long> dp(N,Inf);
	
	dp[x[0]] = 0LL;
	
	rep(i,Q-1){
		vector<long long> ndp(N,Inf);

		dfs(E,dp,ndp,dis,x[i+1],x[i],x[i+1]);
		
		rep(j,N){
			ndp[j] = min(ndp[j],dp[j] + dis[x[i]][x[i+1]]);
		}
		
		swap(dp,ndp);
		
		
	}
	
	long long ans = Inf;
	rep(i,N)ans = min(ans,dp[i]);
	
	cout<<ans<<endl;
	
	
    return 0;
}
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