Submission #435929

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
435929	2021-06-24 01:17:10	cgiosy	Biochips (IZhO12_biochips)	C++17	0 / 100	1 ms	204 KiB

biochips

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#include <bits/stdc++.h>
using namespace std;
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;
  int D[N+1][500], F[N+1], G[N+1]{}, W[N+1];
  for(int i=1; i<=N; i++) {
    int p;
    cin>>p>>W[i];
    if(p) F[i]=G[p], G[p]=i;
    else r=i;
  }
  function<int(int)> dfs=[&](int i) {
    int n=0;
    for(int e=G[i]; e; e=F[e]) {
      int m=dfs(e), j=min(n+m, K);
      while(n<j) D[i][n++]=-1e9;
      while(--j) for(int k=min(m, j); k--;)
        mx(D[i][j], D[i][j-k-1]+D[e][k]);
      for(int k=0; k<m; k++) mx(D[i][k], D[e][k]);
    }
    if(n) mx(D[i][0], W[i]);
    else D[i][n++]=W[i];
    return n;
  };
  cout<<D[r][dfs(r)-1]<<'\n';
}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Compilation message (stderr)

biochips.cpp: In function 'int main()':
biochips.cpp:29:24: warning: 'r' may be used uninitialized in this function [-Wmaybe-uninitialized]
   29 |  cout<<D[r][dfs(r)-1]<<'\n';
      |                        ^~~~

• Subtask 1: 0 / 100