Submission #546489

#	Time	Username	Problem	Language	Result	Execution time	Memory
546489		emuyumi	Friend (IOI14_friend)	C++17	35 / 100	3 ms	2900 KiB

friend

#include "friend.h"
#include <bits/stdc++.h>
using namespace std;
using pii = pair<int, int>;
const int MN = 1e5 + 1, inf = 0x3f3f3f3f;
int dp[MN][2], val[MN];
struct Edge{ int to, t; };
vector<Edge> adj[MN];

void dfs(int v){
    vector<pii> vec = {{0, 0}};
    for (auto [to, t] : adj[v]){
        dfs(to);
        vec.push_back({dp[to][0], dp[to][1]});
        if (t == 1 || t == 2){
            if (t == 1){
                val[v] += dp[to][1];
            }
            pii res = {0, 0};
            for (auto [a, b] : vec){
                res.first += a;
                res.second = max(res.second, b);
            }
            vec = {res};
        }
    }
    int tota = vec[0].first;
    dp[v][0] = vec[0].first;
    dp[v][1] = max(vec[0].first, vec[0].second);
    vec.erase(vec.begin());
    for (auto [a, b] : vec){
        tota += a;
        dp[v][0] += b;
        dp[v][1] += max(a, b);
    }
    dp[v][1] = max(dp[v][1], tota + val[v]);
}

int findSample(int n, int confidence[], int host[], int protocol[]){
    for (int i = 0; i < n; ++i) val[i] = confidence[i];
    for (int i = 1; i < n; ++i){
        adj[host[i]].push_back({i, protocol[i]});
    }
    dfs(0);
    // for (int i = 0; i < n; ++i) cout << i << ": " << dp[i][0] << " " << dp[i][1] << '\n';
    return max(dp[0][0], dp[0][1]);
}

• Subtask 1: 0 / 11
• Subtask 2: 8 / 8
• Subtask 3: 8 / 8
• Subtask 4: 19 / 19
• Subtask 5: 0 / 23
• Subtask 6: 0 / 31