Submission #435925

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
435925	2021-06-24 00:44:14	cgiosy	Biochips (IZhO12_biochips)	C++17	0 / 100	2 ms	1868 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[2][200004], 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;
  }
  int n[2]{}, d=0;
  function<int(int)> dfs=[&](int i) {
    int p=n[d];
    for(int e=G[i]; e; e=F[e]) {
      d^=1;
      int m=dfs(e);
      d^=1;
      int q=n[d^1]-=m, j=min(n[d]-p+m, K);
      for(int k=n[d]; k<p+j; k++) D[d][k]=0;
      for(int k=0; k<m; k++) mx(D[d][p+k], D[d^1][q+k]);
      n[d]=p+j;
      while(--j>0) for(int k=min(m, j); k--;)
        mx(D[d][p+j], D[d][p+j-k-1]+D[d^1][q+k]);
    }
    if(p==n[d]) D[d][n[d]++]=W[i];
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Compilation message (stderr)

biochips.cpp: In function 'int main()':
biochips.cpp:7:12: warning: 'r' may be used uninitialized in this function [-Wmaybe-uninitialized]
    7 |  int N, K, r;
      |            ^

• Subtask 1: 0 / 100