Submission #388019

#	Time	Username	Problem	Language	Result	Execution time	Memory
388019		b00n0rp	Biochips (IZhO12_biochips)	C++17	0 / 100	3 ms	4940 KiB

biochips

#include <bits/stdc++.h>
using namespace std;

typedef long double LD;
typedef long long ll;
#define int ll
#define pb push_back
#define mp make_pair
#define REP(i,n) for (int i = 0; i < n; i++)
#define FOR(i,a,b) for (int i = a; i < b; i++)
#define REPD(i,n) for (int i = n-1; i >= 0; i--)
#define FORD(i,a,b) for (int i = a; i >= b; i--)
#define remax(a,b) a = max(a,b)
#define remin(a,b) a = min(a,b)
#define all(v) v.begin(),v.end()
typedef map<int,int> mii;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int,int> pii;
typedef vector<pii> vpii;
#define F first
#define S second
#define PQ(type) priority_queue<type>
#define PQD(type) priority_queue<type,vector<type>,greater<type> >
#define WL(t) while(t --)
#define SZ(x) ((int)(x).size())
#define runtime() ((double)clock() / CLOCKS_PER_SEC)
#define inrange(i,a,b) ((i>=min(a,b)) && (i<=max(a,b))) 
 
const int INF=1e9;
const int MAXN = 200005;

int n,m,root;
vi adj[MAXN];
int par[MAXN],a[MAXN],st[MAXN],fin[MAXN];
int tim = 0;
int dp[MAXN][505];

void dfs(int u){
    st[u] = tim;
    for(auto v:adj[u]) dfs(v);
    FOR(j,1,m+1){
        dp[tim+1][j] = max(dp[tim][j],dp[st[u]][j-1]+a[u]);
    }
    tim++;
}   
 
signed main(){
    cin >> n >> m;
    FOR(i,1,n+1){
        cin >> par[i] >> a[i];
        if(!par[i]) root = i;
        else adj[par[i]].pb(i);
    }
    FOR(i,1,m+1) dp[0][i] = -INF;
    dfs(root);
    cout << dp[n][m] << "\n";
}

• Subtask 1: 0 / 100