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답안 #349196

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
349196 2021-01-17T03:51:21 Z arnold518 Museum (CEOI17_museum) C++14
100 / 100
 475 ms 360348 KB 
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 1e4;
const ll INF = 1e18;

int N, K, R;
vector<pii> adj[MAXN+10];

int sz[MAXN+10];
ll dp1[MAXN+10][MAXN+10], dp2[MAXN+10][MAXN+10];
ll T1[MAXN+10], T2[MAXN+10];

void dfs(int now, int bef)
{
	//printf("%d %d\n", now, bef);
	sz[now]=1;

	dp1[now][0]=INF;
	dp1[now][1]=0;
	dp2[now][0]=INF;
	dp2[now][1]=0;

	for(auto nxt : adj[now])
	{
		if(nxt.first==bef) continue;
		dfs(nxt.first, now);

		for(int i=0; i<=sz[now]+sz[nxt.first]; i++) T1[i]=T2[i]=INF;
		for(int i=0; i<=sz[now]; i++)
		{
			for(int j=0; j<=sz[nxt.first]; j++)
			{
				if(j)
				{
					T1[i+j]=min(T1[i+j], dp1[now][i]+dp2[nxt.first][j]+nxt.second*2);
					T1[i+j]=min(T1[i+j], dp2[now][i]+dp1[nxt.first][j]+nxt.second);
					T2[i+j]=min(T2[i+j], dp2[now][i]+dp2[nxt.first][j]+nxt.second*2);
				}
				else
				{
					T1[i+j]=min(T1[i+j], dp1[now][i]);
					T2[i+j]=min(T2[i+j], dp2[now][i]);
				}
			}
		}
		for(int i=0; i<=sz[now]+sz[nxt.first]; i++)
		{
			dp1[now][i]=T1[i];
			dp2[now][i]=T2[i];
		}
		sz[now]+=sz[nxt.first];
	}
}

int main()
{
	scanf("%d%d%d", &N, &K, &R);
	for(int i=1; i<N; i++)
	{
		int u, v, w;
		scanf("%d%d%d", &u, &v, &w);
		adj[u].push_back({v, w});
		adj[v].push_back({u, w});
	}

	dfs(R, R);
	printf("%lld\n", dp1[R][K]);
}

Compilation message

museum.cpp: In function 'int main()':
museum.cpp:62:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   62 |  scanf("%d%d%d", &N, &K, &R);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~
museum.cpp:66:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   66 |   scanf("%d%d%d", &u, &v, &w);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 748 KB Output is correct
2 Correct 1 ms 748 KB Output is correct
3 Correct 1 ms 748 KB Output is correct
4 Correct 1 ms 748 KB Output is correct
5 Correct 1 ms 620 KB Output is correct

Subtask #2
25.0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 215 ms 87660 KB Output is correct
2 Correct 217 ms 88300 KB Output is correct
3 Correct 463 ms 352668 KB Output is correct
4 Correct 300 ms 169220 KB Output is correct
5 Correct 230 ms 105452 KB Output is correct

Subtask #3
35.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 215 ms 87660 KB Output is correct
2 Correct 217 ms 88300 KB Output is correct
3 Correct 463 ms 352668 KB Output is correct
4 Correct 300 ms 169220 KB Output is correct
5 Correct 230 ms 105452 KB Output is correct
6 Correct 214 ms 86380 KB Output is correct
7 Correct 370 ms 241132 KB Output is correct
8 Correct 471 ms 84844 KB Output is correct
9 Correct 379 ms 84972 KB Output is correct
10 Correct 242 ms 86124 KB Output is correct

Subtask #4
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 748 KB Output is correct
2 Correct 1 ms 748 KB Output is correct
3 Correct 1 ms 748 KB Output is correct
4 Correct 1 ms 748 KB Output is correct
5 Correct 1 ms 620 KB Output is correct
6 Correct 215 ms 87660 KB Output is correct
7 Correct 217 ms 88300 KB Output is correct
8 Correct 463 ms 352668 KB Output is correct
9 Correct 300 ms 169220 KB Output is correct
10 Correct 230 ms 105452 KB Output is correct
11 Correct 214 ms 86380 KB Output is correct
12 Correct 370 ms 241132 KB Output is correct
13 Correct 471 ms 84844 KB Output is correct
14 Correct 379 ms 84972 KB Output is correct
15 Correct 242 ms 86124 KB Output is correct
16 Correct 215 ms 89068 KB Output is correct
17 Correct 214 ms 88444 KB Output is correct
18 Correct 318 ms 189036 KB Output is correct
19 Correct 406 ms 84844 KB Output is correct
20 Correct 223 ms 86508 KB Output is correct
21 Correct 358 ms 234988 KB Output is correct
22 Correct 215 ms 88172 KB Output is correct
23 Correct 401 ms 84844 KB Output is correct
24 Correct 219 ms 86124 KB Output is correct
25 Correct 475 ms 360348 KB Output is correct