Submission #162583

#	Time	Username	Problem	Language	Result	Execution time	Memory
162583		darkkcyan	Biochips (IZhO12_biochips)	C++14	0 / 100	485 ms	524288 KiB

biochips

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

#define llong long long 
#define xx first
#define yy second
#define len(x) ((int)x.size())
#define rep(i,n) for (int i = -1; ++ i < n; )
#define rep1(i,n) for (int i = 0; i ++ < n; )
#define all(x) x.begin(), x.end()
// #define rand __rand
// mt19937 rng(chrono::system_clock::now().time_since_epoch().count());  // or mt19937_64
// template<class T = int> T rand(T range = numeric_limits<T>::max()) {
    // return (T)(rng() % range);
// }

#define maxn 200010
#define maxm 555
int n, m;
int a[maxn];
vector<int> gr[maxn];

vector<int> topo_a, prev_pos;
void dfs(int u) {
    int t = len(topo_a);
    for (auto v: gr[u]) {
        dfs(v);
    }
    topo_a.push_back(a[u]);
    prev_pos.push_back(t);
}

llong dp[maxn][maxm];
int main(void) {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> n >> m;

    rep1(i, n) {
        int p; cin >> p >> a[i];
        gr[p].push_back(i);
    }

    dfs(0);
    rep(i, m + 1) dp[0][i] = INT_MIN;
    dp[0][0] = 0;

    rep(i, n) {
        memcpy(dp[i + 1], dp[i], sizeof(dp[i]));
        rep1(f, m) {
            dp[i + 1][f] = max(dp[i + 1][f], dp[prev_pos[i]][f - 1] + topo_a[i]);
        }

    }

    cout << dp[n][m];

    return 0;
}

• Subtask 1: 0 / 100