oj.uz

Submission #161923

# Submission time Handle Problem Language Result Execution time Memory
161923 2019-11-05T10:05:27 Z shayan_p Chase (CEOI17_chase) C++14
50 / 100
 603 ms 260424 KB 
// Remember...

#include<bits/stdc++.h>

#define F first
#define S second
#define PB push_back
#define sz(s) int((s).size())
#define bit(n,k) (((n)>>(k))&1)

using namespace std;

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

const int maxn=1e5+10, maxk=105;
const ll inf=1e18;

vector<int> v[maxn];
int a[maxn], n, k;
ll dn[maxn][maxk], up[maxn][maxk], arr[maxk], ANS;
int who[maxn][maxk][2];

void dfsdn(int u,int par=-1){
    memset(dn[u],0,sizeof dn[u]);
    ll num=0;
    for(int y:v[u]){
	if(y==par) continue;
	num+= a[y];
    }
    for(int y:v[u]){
	if(y==par) continue;
	dfsdn(y,u);
	for(int i=0;i<=k;i++)
	    dn[u][i]= max( dn[u][i], dn[y][i] );
	for(int i=0;i< k;i++)
	    dn[u][i+1]= max( dn[u][i+1], dn[y][i] + num );
    }
    for(int i=1;i<=k;i++)
	dn[u][i]= max(dn[u][i], num);
    for(int i=0;i<=k;i++)
	who[u][i][0]= who[u][i][1]= -1;
    for(int y:v[u]){
	if(y==par) continue;
	for(int i=0;i<=k;i++){
	    if(who[u][i][0]==-1 || dn[y][i]>dn[ who[u][i][0] ][i])
		who[u][i][1]= who[u][i][0], who[u][i][0]=y;
	    else if(who[u][i][1]==-1 || dn[y][i]>dn[ who[u][i][1] ][i])
		who[u][i][1]=y;
	}
    }
    ANS=max(ANS, dn[u][k]);
}
void dfs(int u,int par=-1){
    ll num=0;
    for(int y:v[u])
	num+= a[y];
    for(int y:v[u]){
	if(y==par) continue;
	dfs(y,u);
	for(int i=0;i<=k;i++){
	    arr[i]= up[y][i];
	}
	for(int i=1;i<=k;i++){
	    arr[i]= max(arr[i], up[y][i-1] + num - a[y]);
	}
	for(int i=0;i<=k;i++){
	    int vert= who[u][k-i][0] == y ? who[u][k-i][1] : who[u][k-i][0];
	    ANS=max(ANS, arr[i] + dn[vert][k-i]);
	}
	for(int i=0;i<=k;i++){
	    up[u][i]= max(up[u][i], arr[i]);
	}
    }
    for(int i=1;i<=k;i++){
	up[u][i]= max(up[u][i], num);
    }
    ANS=max(ANS, up[u][k]);
}

int main(){
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie();

    cin>>n>>k;

    for(int i=1;i<=n;i++){
	cin>>a[i];
    }
    for(int i=0;i<n-1;i++){
	int a,b; cin>>a>>b;
	v[a].PB(b);
	v[b].PB(a);
    }
    dfsdn(1), dfs(1);
    return cout<<ANS<<endl,0;
}
// Deathly mistakes:
//  * Read the problem carefully.
//  * Check maxn.
//  * Overflows.


// #pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 2808 KB Output is correct
2 Correct 4 ms 2808 KB Output is correct
3 Correct 4 ms 2808 KB Output is correct
4 Correct 4 ms 2680 KB Output is correct
5 Correct 5 ms 2808 KB Output is correct
6 Correct 4 ms 2680 KB Output is correct

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 2808 KB Output is correct
2 Correct 4 ms 2808 KB Output is correct
3 Correct 4 ms 2808 KB Output is correct
4 Correct 4 ms 2680 KB Output is correct
5 Correct 5 ms 2808 KB Output is correct
6 Correct 4 ms 2680 KB Output is correct
7 Incorrect 8 ms 5240 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #3
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 603 ms 260424 KB Output is correct
2 Correct 554 ms 260300 KB Output is correct
3 Correct 427 ms 254572 KB Output is correct
4 Correct 390 ms 253944 KB Output is correct
5 Correct 599 ms 253920 KB Output is correct
6 Correct 590 ms 254072 KB Output is correct
7 Correct 603 ms 253816 KB Output is correct

Subtask #4
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 2808 KB Output is correct
2 Correct 4 ms 2808 KB Output is correct
3 Correct 4 ms 2808 KB Output is correct
4 Correct 4 ms 2680 KB Output is correct
5 Correct 5 ms 2808 KB Output is correct
6 Correct 4 ms 2680 KB Output is correct
7 Incorrect 8 ms 5240 KB Output isn't correct
8 Halted 0 ms 0 KB -