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답안 #105290

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
105290 2019-04-11T06:40:18 Z ryansee Chase (CEOI17_chase) C++14
40 / 100
 1803 ms 491832 KB 
#include "bits/stdc++.h"
using namespace std;
#define FAST ios::sync_with_stdio(false); cin.tie(0);
#define ll long long int
#define ld long double
#define pb push_back
#define ins insert
#define ph push
#define mmst(x,v) memset(x,v,sizeof(x))
#define all(x) (x).begin(), (x).end()
#define FOR(i,s,e) for(ll i=s;i<e;i++)
#define cbr cerr << "hi\n"
#define MAXN (100006)
#define LLINF ((long long)1e18)
typedef pair <ll, ll> pi;
typedef pair <ll, pi> spi;
ll n, A[MAXN], dp[MAXN][102][3], V,ans, alu[MAXN][102][3];
vector<ll>v[MAXN];
// 0 - went down (aka. kid pressed) 
// 1 - ready to go up (aka. pressed)
void up(ll &x, ll y) { x=max(x,y); }
void dfs(ll x, ll p) {
    FOR(i,0,V+1) dp[x][i][0]=dp[x][i][1]==-LLINF,alu[x][i][0]=alu[x][i][1]=0;
	ll sum = 0; for(auto i:v[x])if(i!=p)sum+=A[i];
	//~ if(p == -1) {
		//~ dp[x][1][1] = sum; if(V>=1)ans = max(ans,sum);
		//~ dp[x][0][1] = 0;
	//~ } else {
		//~ FOR(i,0,V+1) {
			//~ up(dp[x][i][0],dp[p][i][1]);
			//~ up(dp[x][i][1],dp[p][i][0]); // np
			//~ up(dp[x][i][1],dp[p][i][1]);
			//~ if(i>0)up(dp[x][i][1],dp[p][i-1][0]+sum); // press
			//~ if(i>0)up(dp[x][i][1],dp[p][i-1][1]+sum);
//~ // 			up(dp[x][i][2],max({dp[p][i][2],dp[p][i][0]}));
			//~ ans=max({ans,dp[x][i][0],dp[x][i][1]});
		//~ }
	//~ }
	if(v[x].size()==1&&p!=-1) { dp[x][1][1] = sum;  dp[x][0][1] = 0; if(V>=1)ans=max(ans,sum);}
	alu[x][1][1] = sum+A[p]; if(V>=1)ans = max(ans,sum+A[p]);
	for(auto i : v[x]) if(i!=p) {
		dfs(i,x); // sum -= A[i];
		FOR(b,0,V+1) {
			up(dp[x][b][0], dp[i][b][1]);
			up(dp[x][b][1], max(dp[i][b][0],dp[i][b][1]));
			if(b>0)up(dp[x][b][1],max(dp[i][b-1][0],dp[i][b-1][1])+sum);
			// ans=max({ans,dp[x][b][0],dp[x][b][1]});
		}
		//~ sum += A[i];
	}
	//~ 0 - went down
	//~ 1 - stayed
	if(p!=-1)sum += A[p];
	for(auto i : v[x]) if(i!=p) {
		sum -= A[i];
		FOR(b,0,V+1) {
			up(alu[x][b][0],alu[i][b][1]);
			up(alu[x][b][1],max(alu[i][b][0],alu[i][b][1]));
			if(b>0)up(alu[x][b][1],max(alu[i][b-1][0],alu[i][b-1][1])+sum);
			ans=max({ans,alu[x][b][0],alu[x][b][1]});
		}
		sum += A[i];
	}
	// if(x==6||x==7) cerr << x << ' ' << alu[x][1][0]
	return;
}
 
int main()
{
	// freopen("in","r",stdin);
	FAST
	cin>>n>>V; if(n==1) { cout << 0 << '\n'; return 0; }
	FOR(i,1,n+1)cin>>A[i]; for(ll i=0;i<n-1;i++) { ll a, b; cin >> a >> b; v[a].pb(b); v[b].pb(a); }
// 	ll ans = 0;
	FOR(i,1,n+1) {
	    if((i>1&&n>1000))break;
// 		for(ll i=0;i<MAXN;i++) for(ll j=0;j<102;j++) dp[i][j][0]=dp[i][j][1]=dp[i][j][2]=-LLINF;
		dfs(i,-1);
	// ll ans = 0;
// 		for(ll i=1;i<=n;i++) for(ll j=0;j<=V;j++)ans=max({ans,dp[i][j][0],dp[i][j][1],dp[i][j][2]}); 
	}
	//~ dfs(6,-1);
	cout<<ans<<'\n';
}
/*
 * 
12 2
2 3 3 8 1 5 6 7 8 3 5 4
2 1
2 7
3 4
4 7
7 6
5 6
6 8
6 9
7 10
10 11
10 12
* 
*/

Compilation message

chase.cpp: In function 'int main()':
chase.cpp:11:20: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
 #define FOR(i,s,e) for(ll i=s;i<e;i++)
                    ^
chase.cpp:73:2: note: in expansion of macro 'FOR'
  FOR(i,1,n+1)cin>>A[i]; for(ll i=0;i<n-1;i++) { ll a, b; cin >> a >> b; v[a].pb(b); v[b].pb(a); }
  ^~~
chase.cpp:73:25: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  FOR(i,1,n+1)cin>>A[i]; for(ll i=0;i<n-1;i++) { ll a, b; cin >> a >> b; v[a].pb(b); v[b].pb(a); }
                         ^~~

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 2816 KB Output is correct
2 Correct 5 ms 2816 KB Output is correct
3 Correct 5 ms 2816 KB Output is correct
4 Correct 5 ms 2688 KB Output is correct
5 Correct 6 ms 2688 KB Output is correct
6 Correct 4 ms 2816 KB Output is correct

Subtask #2
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 2816 KB Output is correct
2 Correct 5 ms 2816 KB Output is correct
3 Correct 5 ms 2816 KB Output is correct
4 Correct 5 ms 2688 KB Output is correct
5 Correct 6 ms 2688 KB Output is correct
6 Correct 4 ms 2816 KB Output is correct
7 Correct 1558 ms 7644 KB Output is correct
8 Correct 171 ms 7552 KB Output is correct
9 Correct 147 ms 7552 KB Output is correct
10 Correct 1803 ms 7672 KB Output is correct
11 Correct 653 ms 7672 KB Output is correct
12 Correct 221 ms 7580 KB Output is correct

Subtask #3
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 923 ms 491832 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 5 ms 2816 KB Output is correct
2 Correct 5 ms 2816 KB Output is correct
3 Correct 5 ms 2816 KB Output is correct
4 Correct 5 ms 2688 KB Output is correct
5 Correct 6 ms 2688 KB Output is correct
6 Correct 4 ms 2816 KB Output is correct
7 Correct 1558 ms 7644 KB Output is correct
8 Correct 171 ms 7552 KB Output is correct
9 Correct 147 ms 7552 KB Output is correct
10 Correct 1803 ms 7672 KB Output is correct
11 Correct 653 ms 7672 KB Output is correct
12 Correct 221 ms 7580 KB Output is correct
13 Incorrect 923 ms 491832 KB Output isn't correct
14 Halted 0 ms 0 KB -