Submission #342887

#	Time	Username	Problem	Language	Result	Execution time	Memory
342887		IZhO_2021_I_want_Silver	Biochips (IZhO12_biochips)	C++14	0 / 100	2083 ms	270524 KiB

biochips

#include <iostream>
#include <algorithm>
#include <vector>
#include <cmath>
#include <set>
#include <map>
#include <iomanip>
#include <cassert>
#include <stack>
#include <queue>
#include <deque>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>-

using namespace std;
//using namespace __gnu_pbds;

typedef long long ll;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;

// template<typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
//  order_of_key (k) : Number of items strictly smaller than k .
//  find_by_order(k) : K-th element in a set (counting from zero).
#define sz(a) (int)a.size()
#define all(a) a.begin(), a.end()
#define pb push_back
#define ppb pop_back
#define mkp make_pair
#define F first
#define S second
#define lb lower_bound
#define ub upper_bound
#define show(a) cerr << #a <<" -> "<< a <<" "
#define nl cerr <<"\n"
//#define int ll

const int N = 2e5 + 5;
const int oo = 1e9 + 5;

int n, m, root, val[N], sz[N], dp[N][505];
vector <int> g[N];

void dfs(int v, int pr) {
    if (!sz(g[v])) { sz[v] = 1; }

    for (int to : g[v]) {
        if (to == pr) { continue; }
        dfs(to, v);
        sz[v] += sz[to];

        for (int i = min(sz[v], m); i >= 1; --i) {
            dp[v][i] = max(dp[v][i], dp[to][i]);
            for (int j = i-1; j >= 1; --j) {
                dp[v][i] = max(dp[v][i], dp[v][j] + dp[to][i-j]);
            }
        }
    }
    dp[v][1] = max(dp[v][1], val[v]);
}

void solve() {
    cin >> n >> m;
    for (int a = 1; a <= n; ++a) {
        int b, c;
        cin >> b >> c;
        if (b == 0) { root = a; }
        else {
            g[b].pb(a);
            val[a] = c;
        }
    }
    dfs(root, -1);
    cout << dp[root][m];
}

 main () {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	int tests = 1;
	//cin >> tests;
	while (tests --) {
		solve();
	}
	return 0;
}
/*
    Just Chalish!
*/

Compilation message (stderr)

biochips.cpp:77:8: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   77 |  main () {
      |        ^

• Subtask 1: 0 / 100