Submission #999136

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
999136	2024-06-15 07:17:23	vjudge1	Sumtree (INOI20_sumtree)	C++17	0 / 100	2 ms	1884 KiB

Main

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#include <bits/stdc++.h>
using namespace std;
const int N = 10000;
const int MAXNC = 5*N;
const int mod = 1e9+7;
vector<int> g[N];
long long fact[MAXNC];
int sz[N], tagsm[N];
int tag[N], tmptag[N];
long long binpow(long long a, long long b) {
  long long res = 1;
  while(b) {
    if(b&1) {
      res=(res*a)%mod;
    }
    a=(a*a)%mod;
    b>>=1;
  }
  return res;
}
long long ncr(long long nn, long long rr) {
  if(rr > nn)return 0;
  if(rr < 0)return 0;
  long long res = fact[nn];
  res = (res*binpow(fact[rr], mod-2))%mod;
  res = (res*binpow(fact[nn-rr], mod-2))%mod;
  return res;
}
long long ans=1;
void dfs(int at, int p) {
 
 
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