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Submission #435958

# Submission time Handle Problem Language Result Execution time Memory
435958 2021-06-24T02:34:51 Z cgiosy Biochips (IZhO12_biochips) C++17
100 / 100
 207 ms 9956 KB 
// 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>>inp[i];
		if(p) g[p].push_back(i);
		else root=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:26:6: warning: unused variable 'W' [-Wunused-variable]
   26 |  int W[n+1];
      |      ^

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 4940 KB Output is correct
2 Correct 4 ms 4976 KB Output is correct
3 Correct 4 ms 4940 KB Output is correct
4 Correct 8 ms 5324 KB Output is correct
5 Correct 8 ms 5320 KB Output is correct
6 Correct 8 ms 5324 KB Output is correct
7 Correct 117 ms 8996 KB Output is correct
8 Correct 114 ms 9028 KB Output is correct
9 Correct 162 ms 9628 KB Output is correct
10 Correct 207 ms 9956 KB Output is correct