oj.uz

답안 #35067

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
35067 2017-11-17T21:52:50 Z model_code Museum (CEOI17_museum) C++11
100 / 100
 649 ms 784904 KB 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <iostream>
#include <sstream>
#include <vector>
#include <string>
#include <math.h>
#include <queue>
#include <list>
#include <algorithm>
#include <map>
#include <set>
#include <stack>
#include <ctime>
#include <iterator>
using namespace std;

#define ALL(c) (c).begin(),(c).end()
#define IN(x,c) (find(c.begin(),c.end(),x) != (c).end())
#define REP(i,n) for (int i=0;i<(int)(n);i++)
#define FOR(i,a,b) for (int i=(a);i<=(b);i++)
#define INIT(a,v) memset(a,v,sizeof(a))
#define SORT_UNIQUE(c) (sort(c.begin(),c.end()), c.resize(distance(c.begin(),unique(c.begin(),c.end()))))
template<class A, class B> A cvt(B x) { stringstream ss; ss<<x; A y; ss>>y; return y; }

typedef pair<int,int> PII;
typedef long long int64;

#define M 10000
#define INF 1000000000

int N,K,X;
vector<PII> adj[M+1];
int sz[M+1];
int f[M+1][M+1][2];
int g[2][M+1][2];

void solve(int x, int p=-1) {
	vector<PII> ch={{-1,-1}};
	int c=0;
	sz[x]=1;
	for (PII yt : adj[x]) if (yt.first!=p) {
		solve(yt.first, x);
		sz[x]+=sz[yt.first];
		ch.push_back(yt);
		c++;
	}
	FOR (k,0,K) REP (t,2) f[x][k][t]=INF;
	if (c==0) {
		f[x][1][0]=0;
		f[x][1][1]=0;
	} else {
		FOR (k,0,K) REP (t,2) { g[0][k][t]=INF; }
		g[0][0][0]=0;
		g[0][0][1]=0;
		int s=0;
		FOR (i,1,c) {
			FOR (k,0,K) REP (t,2) { g[i%2][k][t]=INF; }
			int si=sz[ch[i].first];
			FOR (k,0,min(s,K)) {
				// t=0
				g[i%2][k][0]=min(g[i%2][k][0], g[(i-1)%2][k][0]);
				FOR (h,1,min(si,K-k)) {
					g[i%2][k+h][0]=min(g[i%2][k+h][0], g[(i-1)%2][k][0]+2*ch[i].second+f[ch[i].first][h][0]);
				}
				// t=1 (wildcard)
				g[i%2][k][1]=min(g[i%2][k][1], g[(i-1)%2][k][1]);
				FOR (h,1,min(si,K-k)) {
					int score = min(g[(i-1)%2][k][1]+2*ch[i].second+f[ch[i].first][h][0], // don't use it
					                g[(i-1)%2][k][0]+1*ch[i].second+f[ch[i].first][h][1]); // use it
					g[i%2][k+h][1]=min(g[i%2][k+h][1], score);
				}
			}
			s+=si;
		}
		FOR (k,1,min(sz[x],K)) {
			REP (t,2) {
				f[x][k][t]=g[c%2][k-1][t];
			}
		}
	}
}

int main() {
	scanf("%d %d %d",&N,&K,&X);
	REP (i,N-1) {
		int a,b,c;
		scanf("%d %d %d",&a,&b,&c);
		adj[a].push_back({b,c});
		adj[b].push_back({a,c});
	}
	solve(X);
	printf("%d\n",f[X][K][1]);
	return 0;
}

Compilation message

museum.cpp: In function 'int main()':
museum.cpp:87:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d",&N,&K,&X);
                            ^
museum.cpp:90:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d %d",&a,&b,&c);
                             ^

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 783852 KB Output is correct
2 Correct 0 ms 783852 KB Output is correct
3 Correct 0 ms 783852 KB Output is correct
4 Correct 0 ms 783852 KB Output is correct
5 Correct 0 ms 783852 KB Output is correct

Subtask #2
25.0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 784248 KB Output is correct
2 Correct 16 ms 784248 KB Output is correct
3 Correct 16 ms 784796 KB Output is correct
4 Correct 19 ms 784320 KB Output is correct
5 Correct 6 ms 784248 KB Output is correct

Subtask #3
35.0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 784248 KB Output is correct
2 Correct 16 ms 784248 KB Output is correct
3 Correct 16 ms 784796 KB Output is correct
4 Correct 19 ms 784320 KB Output is correct
5 Correct 6 ms 784248 KB Output is correct
6 Correct 19 ms 784248 KB Output is correct
7 Correct 29 ms 784500 KB Output is correct
8 Correct 29 ms 784572 KB Output is correct
9 Correct 29 ms 784388 KB Output is correct
10 Correct 13 ms 784248 KB Output is correct

Subtask #4
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 783852 KB Output is correct
2 Correct 0 ms 783852 KB Output is correct
3 Correct 0 ms 783852 KB Output is correct
4 Correct 0 ms 783852 KB Output is correct
5 Correct 0 ms 783852 KB Output is correct
6 Correct 6 ms 784248 KB Output is correct
7 Correct 16 ms 784248 KB Output is correct
8 Correct 16 ms 784796 KB Output is correct
9 Correct 19 ms 784320 KB Output is correct
10 Correct 6 ms 784248 KB Output is correct
11 Correct 19 ms 784248 KB Output is correct
12 Correct 29 ms 784500 KB Output is correct
13 Correct 29 ms 784572 KB Output is correct
14 Correct 29 ms 784388 KB Output is correct
15 Correct 13 ms 784248 KB Output is correct
16 Correct 99 ms 784248 KB Output is correct
17 Correct 379 ms 784248 KB Output is correct
18 Correct 109 ms 784364 KB Output is correct
19 Correct 109 ms 784468 KB Output is correct
20 Correct 89 ms 784248 KB Output is correct
21 Correct 616 ms 784480 KB Output is correct
22 Correct 533 ms 784248 KB Output is correct
23 Correct 589 ms 784532 KB Output is correct
24 Correct 529 ms 784248 KB Output is correct
25 Correct 649 ms 784904 KB Output is correct