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Submission #337138

# Submission time Handle Problem Language Result Execution time Memory
337138 2020-12-18T15:31:24 Z nvmdava Biochips (IZhO12_biochips) C++17
100 / 100
 363 ms 403308 KB 
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ff first
#define ss second
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int N = 200'005;
const ll MOD = 1'000'000'007;
const int INF = 0x3f3f3f3f;

int dp[N][505];
vector<int> ch[N];
int cnt = 1, w[N], ww[N], l[N];

void dfs(int v){
    int t = cnt;
    for(auto& x : ch[v])
        dfs(x);
    ww[cnt] = w[v];
    l[cnt++] = t;

}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int n, m;
    cin>>n>>m;

    int root;

    for(int p, i = 1; i <= n; ++i){
        cin>>p>>w[i];
        if(p)
            ch[p].push_back(i);
        else
            root = i;
    }

    dfs(root);
    for(int i = 0; i <= n; ++i)
        for(int j = 1; j <= m; ++j)
            dp[i][j] = -0x3f3f3f3f;
    for(int i = 1; i <= n; ++i)
        for(int j = 1; j <= m; ++j)
            dp[i][j] = max(dp[i - 1][j], dp[l[i] - 1][j - 1] + ww[i]);
    cout<<dp[n][m];
}

Compilation message

biochips.cpp: In function 'int main()':
biochips.cpp:42:8: warning: 'root' may be used uninitialized in this function [-Wmaybe-uninitialized]
   42 |     dfs(root);
      |     ~~~^~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 5100 KB Output is correct
2 Correct 4 ms 5100 KB Output is correct
3 Correct 4 ms 5228 KB Output is correct
4 Correct 16 ms 22892 KB Output is correct
5 Correct 17 ms 25216 KB Output is correct
6 Correct 18 ms 25196 KB Output is correct
7 Correct 244 ms 300872 KB Output is correct
8 Correct 254 ms 300924 KB Output is correct
9 Correct 301 ms 365420 KB Output is correct
10 Correct 363 ms 403308 KB Output is correct