Submission #1051409

#	Time	Username	Problem	Language	Result	Execution time	Memory
1051409		12345678	File Paths (BOI15_fil)	C++17	0 / 100	2 ms	1372 KiB

fil

#include <bits/stdc++.h>

using namespace std;

const int nx=6e3+5, kx=1e6+5;

int n, m, k, sz, pa[nx], dist[nx], w, res[nx], cnt[nx], vs[nx];
vector<pair<int, int>> d[nx];
vector<int> fact[nx];

void dfs(int u)
{
    for (auto [v, w]:d[u]) dist[v]=dist[u]+w, dfs(v);
}

void dfs3(int u, int vl, int rt)
{
    if (dist[u]-dist[rt]+sz+1<=k) cnt[dist[u]-dist[rt]+sz+1]+=vl;
    for (auto [v, w]:d[u]) dfs3(v, vl, rt);
}

void dfs2(int u)
{
    if (u<=n) dfs3(u, 1, u);
    if (u>n) for (auto x:fact[k-dist[u]]) if (cnt[x]>0) res[u]=1;
    for (auto [v, w]:d[u]) dfs2(v);
    if (u<=n) dfs3(u, -1, u);
}

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>m>>k>>sz;
    for (int i=1; i<=n; i++) cin>>pa[i]>>w, d[pa[i]].push_back({i, w+1});
    for (int i=n+1; i<=n+m; i++) cin>>pa[i]>>w, d[pa[i]].push_back({i, w+1});
    dfs(0);
    for (int i=n+1; i<=n+m; i++) vs[k-dist[i]]=1; 
    for (int i=2; i<=k; i++) for (int j=i; j<=k; j+=i) if (vs[j]) fact[j].push_back(i);
    dfs2(0);
    for (int i=n+1; i<=n+m; i++)
    {
        if (dist[i]==k) res[i]=1;
        set<int> s;
        s.insert(0);
        int tmp=i;
        while (tmp!=0) s.insert(dist[i]-dist[pa[tmp]]), tmp=pa[tmp];
        for (int j=0; j<=n; j++) if (s.find(k-dist[j]-sz-1)!=s.end()) res[i]=1;
        if (res[i]) cout<<"YES\n";
        else cout<<"NO\n"; 
    }
}

• Subtask 1: 0 / 33
• Subtask 2: 0 / 33
• Subtask 3: 0 / 34