Submission #462508

#	Time	Username	Problem	Language	Result	Execution time	Memory
462508		SamAnd	Biochips (IZhO12_biochips)	C++17	100 / 100	615 ms	412556 KiB

biochips

#include <bits/stdc++.h>
using namespace std;
#define m_p make_pair
#define all(x) (x).begin(),(x).end()
#define sz(x) ((int)(x).size())
#define fi first
#define se second
typedef long long ll;
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
mt19937 rnf(2106);
const int N = 200005, M = 503, INF = 1000000009;

int n, m;
int a[N];
vector<int> g[N];

int tin[N], tout[N], ti;
void dfs(int x)
{
    tin[x] = ++ti;
    for (int i = 0; i < g[x].size(); ++i)
    {
        int h = g[x][i];
        dfs(h);
    }
    tout[x] = ti;
}

vector<pair<int, int> > v[N];

int dp[N][M];

void solv()
{
    cin >> n >> m;
    for (int x = 1; x <= n; ++x)
    {
        int p;
        cin >> p;
        g[p].push_back(x);
        cin >> a[x];
    }

    dfs(g[0][0]);

    for (int x = 1; x <= n; ++x)
        v[tout[x]].push_back(m_p(tin[x], a[x]));

    for (int i = 0; i <= n; ++i)
    {
        for (int j = 0; j <= m; ++j)
        {
            dp[i][j] = -INF;
        }
        dp[i][0] = 0;
    }

    for (int i = 1; i <= n; ++i)
    {
        for (int q = 1; q <= m; ++q)
        {
            for (int j = 0; j < sz(v[i]); ++j)
            {
                dp[i][q] = max(dp[i][q], dp[v[i][j].fi - 1][q - 1] + v[i][j].se);
            }
            dp[i + 1][q] = max(dp[i + 1][q], dp[i][q]);
        }
    }

    cout << dp[n][m] << "\n";
}

int main()
{
    #ifdef SOMETHING
    freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout);
    #endif // SOMETHING
    ios_base::sync_with_stdio(false), cin.tie(0);

    int tt = 1;
    //cin >> tt;
    while (tt--)
    {
        solv();
    }
    return 0;
}

Compilation message (stderr)

biochips.cpp: In function 'void dfs(int)':
biochips.cpp:21:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |     for (int i = 0; i < g[x].size(); ++i)
      |                     ~~^~~~~~~~~~~~~

• Subtask 1: 100 / 100