oj.uz

답안 #311633

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
311633 2020-10-10T20:05:34 Z bigg Chase (CEOI17_chase) C++14
100 / 100
 323 ms 273400 KB 
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int MAXN = 1e5 + 10;
const int MAXK = 110;
ll dp1[MAXN][MAXK], dp2[MAXN][MAXK];
ll s[MAXN], a[MAXN];
int crum;
vector<int> grafo[MAXN];
ll ans;
void dfs(int x, int p){
	pair<ll, ll> maxi[MAXK];
	for(int i = 0; i <= crum; i++){

		maxi[i] = make_pair(0, 0);
 	}
 	dp1[x][0] = dp2[x][0] = 0;
	dp2[x][1] = s[x];
	
	
	for(int i = 0; i < grafo[x].size(); i++){
		int viz = grafo[x][i];
		if(viz == p) continue;
		dfs(viz, x);

		for(int k = 1; k <= crum; k++){
			dp1[x][k] = max(dp1[viz][k], dp1[x][k]);
			dp1[x][k] = max(dp1[x][k], dp1[viz][k-1] + s[x] - a[p]); 
			dp2[x][k] = max(dp2[viz][k], dp2[x][k]);
			dp2[x][k] = max(dp2[x][k], dp2[viz][k-1] + s[x] - a[viz]);
			ll val = dp1[viz][k];
			if(val >= maxi[k].first) swap(maxi[k].first, val);
			if(val >= maxi[k].second) swap(maxi[k].second, val);
		}
	}
	for(int i = 0; i < grafo[x].size(); i++){
		int viz = grafo[x][i];
		if(viz == p) continue;
		ans = max(ans, dp1[viz][crum-1] + s[x]);
		for(int k = 0; k <= crum; k++){
			ll loc = max(dp2[viz][k], k ? dp2[viz][k-1] + s[x] - a[viz] : 0);
			if(dp1[viz][crum-k]!= maxi[crum-k].first) ans = max(ans, loc + maxi[crum - k].first);
			else ans = max(ans, loc + maxi[crum-k].second);
		}
	}
}
int n;
int main(){
	scanf("%d %d", &n, &crum);
	if(crum == 0){
		printf("0\n" );
		return 0;
	}
	for(int i = 1; i <= n; i++) scanf("%lld", &a[i]);
	for(int i = 1; i < n; i++){
		int u, v;
		scanf("%d %d", &u, &v);
		grafo[u].push_back(v);
		grafo[v].push_back(u);
		s[u] += a[v];
		s[v] += a[u];
	}
	dfs(1, 0);
	printf("%lld\n",ans );
}

Compilation message

chase.cpp: In function 'void dfs(int, int)':
chase.cpp:21:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |  for(int i = 0; i < grafo[x].size(); i++){
      |                 ~~^~~~~~~~~~~~~~~~~
chase.cpp:36:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |  for(int i = 0; i < grafo[x].size(); i++){
      |                 ~~^~~~~~~~~~~~~~~~~
chase.cpp: In function 'int main()':
chase.cpp:49:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   49 |  scanf("%d %d", &n, &crum);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~
chase.cpp:54:35: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   54 |  for(int i = 1; i <= n; i++) scanf("%lld", &a[i]);
      |                              ~~~~~^~~~~~~~~~~~~~~
chase.cpp:57:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   57 |   scanf("%d %d", &u, &v);
      |   ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2688 KB Output is correct
2 Correct 2 ms 2688 KB Output is correct
3 Correct 2 ms 2688 KB Output is correct
4 Correct 2 ms 2688 KB Output is correct
5 Correct 2 ms 2688 KB Output is correct
6 Correct 2 ms 2688 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2688 KB Output is correct
2 Correct 2 ms 2688 KB Output is correct
3 Correct 2 ms 2688 KB Output is correct
4 Correct 2 ms 2688 KB Output is correct
5 Correct 2 ms 2688 KB Output is correct
6 Correct 2 ms 2688 KB Output is correct
7 Correct 5 ms 5376 KB Output is correct
8 Correct 4 ms 5376 KB Output is correct
9 Correct 4 ms 4480 KB Output is correct
10 Correct 4 ms 4480 KB Output is correct
11 Correct 4 ms 4480 KB Output is correct
12 Correct 4 ms 4480 KB Output is correct

Subtask #3
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 316 ms 270712 KB Output is correct
2 Correct 314 ms 270072 KB Output is correct
3 Correct 264 ms 180076 KB Output is correct
4 Correct 198 ms 179832 KB Output is correct
5 Correct 283 ms 179964 KB Output is correct
6 Correct 284 ms 179832 KB Output is correct
7 Correct 281 ms 179832 KB Output is correct

Subtask #4
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 2688 KB Output is correct
2 Correct 2 ms 2688 KB Output is correct
3 Correct 2 ms 2688 KB Output is correct
4 Correct 2 ms 2688 KB Output is correct
5 Correct 2 ms 2688 KB Output is correct
6 Correct 2 ms 2688 KB Output is correct
7 Correct 5 ms 5376 KB Output is correct
8 Correct 4 ms 5376 KB Output is correct
9 Correct 4 ms 4480 KB Output is correct
10 Correct 4 ms 4480 KB Output is correct
11 Correct 4 ms 4480 KB Output is correct
12 Correct 4 ms 4480 KB Output is correct
13 Correct 316 ms 270712 KB Output is correct
14 Correct 314 ms 270072 KB Output is correct
15 Correct 264 ms 180076 KB Output is correct
16 Correct 198 ms 179832 KB Output is correct
17 Correct 283 ms 179964 KB Output is correct
18 Correct 284 ms 179832 KB Output is correct
19 Correct 281 ms 179832 KB Output is correct
20 Correct 278 ms 179648 KB Output is correct
21 Correct 2 ms 2688 KB Output is correct
22 Correct 283 ms 181880 KB Output is correct
23 Correct 192 ms 181868 KB Output is correct
24 Correct 292 ms 181880 KB Output is correct
25 Correct 261 ms 181872 KB Output is correct
26 Correct 323 ms 273272 KB Output is correct
27 Correct 318 ms 273400 KB Output is correct