Submission #89307

#	Time	Username	Problem	Language	Result	Execution time	Memory
89307		stefdasca	Biochips (IZhO12_biochips)	C++14	0 / 100	2087 ms	448876 KiB

biochips

/*
        IZhO 12-biochips

    This


*/

#include<bits/stdc++.h>
using namespace std;
int n, m, root, val[200002];
vector<int>v[200002];
int dp1[200002][502], dp2[200002][502], sz1[200002], sz2[200002];
int qq = 0;
void dfs(int nod)
{
     for(int i = 1; i <= m; ++i)
         dp1[nod][i] = dp2[nod][i] = -1;
     dp1[nod][1] = val[nod];
     for(int i = 0; i < v[nod].size(); ++i)
     {
         int vecin = v[nod][i];
         dfs(vecin);
         for(int j = m; j >= 0; --j)
         {
             if(dp2[nod][j] != -1)
                for(int k = 0; k + j <= m; ++k)
                    if(dp2[vecin][k] != -1 || dp1[vecin][k] != -1)
                        dp2[nod][j + k] = max(dp2[nod][j + k], dp2[nod][j] + max(dp1[vecin][k], dp2[vecin][k]));
         }
     }
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    cin >> n >> m;
    for(int i = 1; i <= n; ++i)
    {
        int parent;
        cin >> parent;
        cin >> val[i];
        if(parent == 0)
            root = i;
        else
            v[parent].push_back(i);
    }
    dfs(root);
    cout << max(dp1[root][m], dp2[root][m]) << '\n';
    return 0;
}

Compilation message (stderr)

biochips.cpp: In function 'void dfs(int)':
biochips.cpp:20:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      for(int i = 0; i < v[nod].size(); ++i)
                     ~~^~~~~~~~~~~~~~~

• Subtask 1: 0 / 100