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Submission #435946

# Submission time Handle Problem Language Result Execution time Memory
435946 2021-06-24T02:28:50 Z cgiosy Biochips (IZhO12_biochips) C++17
0 / 100
 4 ms 4940 KB 
#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];
 
void mx(int&a, int b) { a=max(a, b); }
int main() {
	ios::sync_with_stdio(0);cin.tie(0);
	int N, K, r;
	cin>>N>>K;n=N,m=K;
	int D[2][200004], F[N+1], G[N+1]{}, W[N+1];
	for(int i=1; i<=N; i++) {
		int p;
		cin>>p>>W[i];inp[i]=W[i];
		if(p) F[i]=G[p], G[p]=i,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

biochips.cpp: In function 'int main()':
biochips.cpp:27:6: warning: unused variable 'D' [-Wunused-variable]
   27 |  int D[2][200004], F[N+1], G[N+1]{}, W[N+1];
      |      ^
biochips.cpp:27:20: warning: variable 'F' set but not used [-Wunused-but-set-variable]
   27 |  int D[2][200004], F[N+1], G[N+1]{}, W[N+1];
      |                    ^

Subtask #1
0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 4940 KB Output is correct
2 Incorrect 4 ms 4940 KB Output isn't correct
3 Halted 0 ms 0 KB -