oj.uz

답안 #525164

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
525164 2022-02-10T23:03:32 Z Yazan_Alattar Chase (CEOI17_chase) C++14
100 / 100
 529 ms 506864 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define F first
#define S second
#define pb push_back
#define endl "\n"
#define all(x) x.begin(), x.end()
const int M = 100007;
const ll inf = 1e9;
const ll mod = 998244353;
const double pi = acos(-1);
const int dx[] = {1, 0, -1, 0}, dy[] = {0, 1, 0, -1};

vector <int> adj[M];
pair <ll,ll> mx[M][105][2];
int n, v, a[M], who[M][105][2];
ll dp[M][105], ans;

void dfs(int node, int p)
{
	ll sum = 0;
	for(auto i : adj[node]) if(i != p) sum += a[i];
	for(auto i : adj[node]) if(i != p){
		dfs(i, node);
		for(int j = 1; j <= v; ++j) dp[node][j] = max(dp[node][j], max(dp[i][j], dp[i][j - 1] + sum));
	}
	return;
}

void reroot(int node, int p)
{
	ll sum = 0;
	for(auto i : adj[node]) sum += a[i];
	for(auto i : adj[node])	for(int j = 1; j <= v; ++j) dp[node][j] = max(dp[node][j], max(dp[i][j], dp[i][j - 1] + sum));
		
	ans = max(ans, dp[node][v]);
	
	for(auto i : adj[node]){
		for(int j = 1; j <= v; ++j){
			for(int k = 0; k < 2; ++k){
				if(dp[i][j - k] > mx[node][j][k].F){
					mx[node][j][k].S = mx[node][j][k].F;
					mx[node][j][k].F = dp[i][j - k];
					who[node][j][k] = i;
				}
				else if(dp[i][j - k] > mx[node][j][k].S) mx[node][j][k].S = dp[i][j - k];
			}
		}
	}
	
	for(auto i : adj[node]) if(i != p){
		for(int j = 1; j <= v; ++j){
			ll x[2] = {0};
			for(int k = 0; k < 2; ++k){
				if(who[node][j][k] == i) x[k] = mx[node][j][k].S;
				else x[k] = mx[node][j][k].F;
			}
			dp[node][j] = max(x[0], x[1] + sum - a[i]);
		}
		reroot(i, node);
	}
	return;
}

int main()
{
	scanf("%d%d", &n, &v);
	for(int i = 1; i <= n; ++i) scanf("%d", &a[i]);
	for(int i = 1; i < n; ++i){
		int x, y;
		scanf("%d%d", &x, &y);
		adj[x].pb(y);
		adj[y].pb(x);
	}
	dfs(1, 0);
	reroot(1, 0);
	printf("%lld\n", ans);
	return 0;
}

Compilation message

chase.cpp: In function 'int main()':
chase.cpp:68:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |  scanf("%d%d", &n, &v);
      |  ~~~~~^~~~~~~~~~~~~~~~
chase.cpp:69:35: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |  for(int i = 1; i <= n; ++i) scanf("%d", &a[i]);
      |                              ~~~~~^~~~~~~~~~~~~
chase.cpp:72:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |   scanf("%d%d", &x, &y);
      |   ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2636 KB Output is correct
2 Correct 2 ms 2636 KB Output is correct
3 Correct 2 ms 2636 KB Output is correct
4 Correct 2 ms 2648 KB Output is correct
5 Correct 2 ms 2636 KB Output is correct
6 Correct 2 ms 2644 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2636 KB Output is correct
2 Correct 2 ms 2636 KB Output is correct
3 Correct 2 ms 2636 KB Output is correct
4 Correct 2 ms 2648 KB Output is correct
5 Correct 2 ms 2636 KB Output is correct
6 Correct 2 ms 2644 KB Output is correct
7 Correct 6 ms 7628 KB Output is correct
8 Correct 5 ms 7628 KB Output is correct
9 Correct 5 ms 7524 KB Output is correct
10 Correct 6 ms 7628 KB Output is correct
11 Correct 5 ms 7628 KB Output is correct
12 Correct 6 ms 7628 KB Output is correct

Subtask #3
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 489 ms 506820 KB Output is correct
2 Correct 484 ms 506784 KB Output is correct
3 Correct 376 ms 501732 KB Output is correct
4 Correct 313 ms 501468 KB Output is correct
5 Correct 502 ms 501464 KB Output is correct
6 Correct 500 ms 501440 KB Output is correct
7 Correct 529 ms 501516 KB Output is correct

Subtask #4
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 2636 KB Output is correct
2 Correct 2 ms 2636 KB Output is correct
3 Correct 2 ms 2636 KB Output is correct
4 Correct 2 ms 2648 KB Output is correct
5 Correct 2 ms 2636 KB Output is correct
6 Correct 2 ms 2644 KB Output is correct
7 Correct 6 ms 7628 KB Output is correct
8 Correct 5 ms 7628 KB Output is correct
9 Correct 5 ms 7524 KB Output is correct
10 Correct 6 ms 7628 KB Output is correct
11 Correct 5 ms 7628 KB Output is correct
12 Correct 6 ms 7628 KB Output is correct
13 Correct 489 ms 506820 KB Output is correct
14 Correct 484 ms 506784 KB Output is correct
15 Correct 376 ms 501732 KB Output is correct
16 Correct 313 ms 501468 KB Output is correct
17 Correct 502 ms 501464 KB Output is correct
18 Correct 500 ms 501440 KB Output is correct
19 Correct 529 ms 501516 KB Output is correct
20 Correct 502 ms 501424 KB Output is correct
21 Correct 62 ms 8520 KB Output is correct
22 Correct 495 ms 501460 KB Output is correct
23 Correct 362 ms 501428 KB Output is correct
24 Correct 520 ms 501480 KB Output is correct
25 Correct 379 ms 501468 KB Output is correct
26 Correct 457 ms 506840 KB Output is correct
27 Correct 459 ms 506864 KB Output is correct