Submission #1207007

#	Time	Username	Problem	Language	Result	Execution time	Memory
1207007		HishamAlshehri	Biochips (IZhO12_biochips)	C++20	70 / 100	735 ms	402384 KiB

biochips

#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>
 
using namespace std;
// using namespace __gnu_pbds;
 
// #define int long long
#define mod 1000000007
#define base 7001
#define base2 757
#define F first
#define S second
// #define pi acos(-1)
#define double long double
// #define ordered_set tree<int, null_type, less<int>, rb_tree_tag,tree_order_statistics_node_update>
// #define ordered_multiset tree<int, null_type, less_equal<int>, rb_tree_tag,tree_order_statistics_node_update>

// #pragma GCC optimize("O3,Ofast,unroll-loops")
// #pragma GCC target("avx2,sse3,sse4,avx")

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
 
constexpr int maxn = 300001;
const int N = 1 << (int)(ceil(log2(maxn)));

int n, m, a[maxn], siz[maxn];
vector<int> dp[maxn], adj[maxn];

int sizfind(int v) {
    siz[v] = 1;
    for (int u : adj[v]) siz[v] += sizfind(u);
    return siz[v];
}

void dfs(int v) {
    vector<int> ret;
    ret.resize(m + 5, -1e8);
    ret[0] = 0;

    for (int u : adj[v]) {
        dfs(u);
    }

    int cur = 0;
    if (adj[v].size()) {
        cur = siz[adj[v][0]];
        ret = dp[adj[v][0]];
    }

    for (int i = 1; i < adj[v].size(); i++) {
        int u = adj[v][i];
        for (int j = 0; j <= min(siz[u], m); j++) {
            for (int k = 0; k + j <= m && k <= min(cur, m); k++) {
                dp[v][j + k] = max(dp[v][j + k], ret[k] + dp[u][j]);
            }
        }
        ret = dp[v];
        cur += siz[u];
    }

    
    for (int i = 0; i <= min(siz[v], m); i++) dp[v][i] = max(dp[v][i], ret[i]);
    // dp[v] = ret;
    // if (v==7) for (int i : dp[v]) cout << i << " ";

    return;
}

signed main()
{
    cin.tie(0) -> sync_with_stdio(0);
    cin >> n >> m;
    int rt = 0;
    for (int i = 1; i <= n; i++) {
        int p, x; cin >> p >> x;
        a[i] = x;
        if (!p) {rt = i; continue;}
        adj[p].push_back(i);
    }

    for (int i = 1; i <= n; i++) dp[i].resize(m + 5, -1e8);
    for (int i = 1; i <= n; i++) dp[i][0] = 0, dp[i][1] = a[i];
    
    sizfind(rt);
    dfs(rt);

    // for (int i = 1; i <= n; i++) {
    //     for (int j = 0; j <= m; j++) cout << dp[i][j] << ' ';
    //     cout << "\n";
    // }

    // for (int i = 1; i <= n; i++) cout << siz[i] << " ";

    cout << dp[rt][m];
}

• Subtask 1: 70 / 100