Submission #597725

#	Time	Username	Problem	Language	Result	Execution time	Memory
597725		OttoTheDino	Chase (CEOI17_chase)	C++17	0 / 100	728 ms	10076 KiB

chase

#include <bits/stdc++.h>
using namespace std;

#define rep(i,s,e)                  for (ll i = s; i <= e; ++i)
#define rrep(i,s,e)                 for (ll i = s; i >= e; --i)
#define pb                          push_back
#define pf                          push_front
#define fi                          first
#define se                          second
#define all(a)                      a.begin(), a.end()
#define len(a)                      (ll)a.size()
typedef long long ll;
typedef pair<ll, ll> ii;
typedef pair<ll, ll> pll;
typedef vector<ii> vii;
typedef vector<ll> vi;
typedef vector<double> vd;
typedef vector<string> vs;
typedef vector<ll> vll;

const ll mx = 1e5;
ll p[mx+1], s[mx+1], l;
vi adj[mx+1];

ll dfs (ll u, ll par, ll cur, ll cur2, ll cnt)  {
    if (cnt==l) return abs(cur-cur2);
    cur += s[u] - p[par];
    cur2 += p[u];
    ll res = abs(cur-cur2);
    for (ll v : adj[u]) {
        if (v==par) continue;
        res = max(res, dfs(v, u, cur, cur2, cnt+1)); 
    }
    return res;
}

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);

    ll n; cin >> n >> l;

    rep (i,1,n) cin >> p[i];

    rep (i,1,n-1) {
        ll u, v; cin >> u >> v;
        adj[u].pb(v);
        adj[v].pb(u);
    }

    rep (i,1,n) {
        s[i] = p[i];
        for (ll v : adj[i]) s[i] += p[v];
    }

    ll ans = 0;
    rep (i,1,n) ans = max(ans, dfs (i, 0, 0, 0, 0));
    cout << ans << "\n";

    return 0;
}

• Subtask 1: 0 / 20
• Subtask 2: 0 / 20
• Subtask 3: 0 / 30
• Subtask 4: 0 / 30