Submission #435956

#	Time	Username	Problem	Language	Result	Execution time	Memory
435956		cgiosy	Biochips (IZhO12_biochips)	C++17	Compilation error	0 ms	0 KiB

biochips

// gs14004's code test
#include <bits/stdc++.h>
using namespace std;

int n,m,inp[200005];

int piv,sz[200005],a[200005];
vector<int> g[200005];
int root;

int dfs(int x){
    int num = ++piv;
    a[num] = inp[x];
    sz[num] = 1;
    for(int &i : g[x]){
        sz[num] += dfs(i);
    }
    return sz[num];
}
 
int dp[2][200005];

int main() {
	ios::sync_with_stdio(0);cin.tie(0);
	cin>>n>>m;
	int W[n+1];
	for(int i=1; i<=n; i++) {
		int p;
		cin>>p>>W[i];inp[i]=W[i];
		if(p) g[p].push_back(i);
		else root=r=i;
	}
    dfs(root);
    for (int i=1; i<=m; i++) {
        dp[i%2][n+1] = -1e9;
        for (int j=n; j; j--) {
            dp[i%2][j] = max(dp[i%2][j+1],dp[(i-1)%2][j+sz[j]] + a[j]);
        }
    }
	cout<<dp[m%2][1]<<'\n';
}

Compilation message (stderr)

biochips.cpp: In function 'int main()':
biochips.cpp:31:13: error: 'r' was not declared in this scope
   31 |   else root=r=i;
      |             ^