Submission #340153

#	Time	Username	Problem	Language	Result	Execution time	Memory
340153		tengiz05	Biochips (IZhO12_biochips)	C++17	100 / 100	395 ms	403372 KiB

biochips

#include <bits/stdc++.h>
#define all(x) (x).begin(), (x).end()
typedef long long ll;
using namespace std;
template<class T> bool chmin(T& a, const T& b){return a>b?a=b,true:false;}
template<class T> bool chmax(T& a, const T& b){return a<b?a=b,true:false;}
const int N = 2e5+5, M = 505;
const int inf = 1e9;
int n, m;
int dp[N][M], w[N];
vector<int> edges[N];
int timer = 1;
int v[N], l[N];
void dfs(int u){
  int tmp = timer;
  for(auto v : edges[u])
    dfs(v);
  v[timer] = w[u];
  l[timer] = tmp;
  timer++;
}
void Solve(){
  cin >> n >> m;
  int root;
  for(int i=1;i<=n;i++){
    int j, cost;
    cin >> j >> cost;
    if(j > 0)edges[j].push_back(i);
    else root = i;
    w[i] = cost;
  }
  dfs(root);
  for(int i=0;i<=n;i++){
    for(int j=1;j<=m;j++){
      dp[i][j] = -inf;
    }
  }
  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]+v[i]);
    }
  }
  
  cout << dp[n][m] << '\n';
}

signed main(){
  ios_base::sync_with_stdio(false);
  cin.tie();
  int t=1;
  while(t--)Solve();
  return 0;
}

Compilation message (stderr)

biochips.cpp: In function 'void Solve()':
biochips.cpp:32:6: warning: 'root' may be used uninitialized in this function [-Wmaybe-uninitialized]
   32 |   dfs(root);
      |   ~~~^~~~~~

• Subtask 1: 100 / 100