61 lines
1.3 KiB
C++
61 lines
1.3 KiB
C++
#include <bits/stdc++.h>
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using namespace std;
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#ifdef ONLINE_JUDGE
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#define dbg(...)
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#else
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#include "Assets/debug.h"
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#endif
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#define int long long
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#define ll long long
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#define endl '\n'
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#define ff first
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#define ss second
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#define ins insert
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#define pb push_back
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#define ppb pop_back
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#define sz(x) (int)(x).size()
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#define all(x) x.begin(), x.end()
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#define rep(i,a,b) for(int i=a; i<b; ++i)
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#define rrep(i,a,b) for(int i=a; i>=b; --i)
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#define yn(f) f? cout<<"YES\n":cout<<"NO\n"
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#define FAST (ios_base::sync_with_stdio(false), cin.tie(nullptr));
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ll pow(ll x,ll y,ll m=1e9+7) {ll ans=1;x%=m;while(y){if(y&1)ans=(ans*x)%m;x=(x*x)%m;y>>=1;}return ans;}
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void solve()
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{
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int n;
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cin>>n;
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vector<int>adj[n], v(n);
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for(auto &i:v) cin>>i;
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rep(i,1,n)
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{
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int p;
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cin>>p;
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p--;
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adj[p].pb(i);
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}
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function<int (int node)> dfs = [&](int node)->int
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{
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int mn = INT_MAX;
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for(auto child:adj[node])
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mn = min(mn, dfs(child));
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dbg(mn);
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if(node == 0) return mn+v[0];
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if(mn == INT_MAX) return v[node];
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if(v[node] >= mn) return mn;
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return (mn+v[node])/2;
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};
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cout<<dfs(0)<<endl;
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}
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signed main()
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{
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FAST;
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int TCS = 1;
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cin >> TCS;
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for (int TC = 1; TC <= TCS; ++TC)
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{
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// cout<<"Case "<<TC<<": ";
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solve();
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}
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} |