Submission #994988

#	Time	Username	Problem	Language	Result	Execution time	Memory
994988		edogawa_something	Construction of Highway (JOI18_construction)	C++17	16 / 100	2043 ms	45896 KiB

construction

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef vector<ll> vii;
typedef pair<ll,ll> pii;
#define F first 
#define S second 
#define all(v) v.begin(),v.end()
#define pb push_back
#define pow poww
const int M=1e6+10;
const ll mod=998244353;
const ll inf=2e18;
ll pow(ll x,ll y){
  ll res=1;
  x%=mod;
  while(y>0){
    if(y%2==1){
      res*=x,res%=mod;  
    }
    x*=x,x%=mod;
    y/=2;
  }
  return res;
}
ll n,C[M],a[M],pa[M],b[M];
vii adj[M];
map<ll,ll>mp;
void update(ll x){
  for(int i=x;i<=n;i+=(i&-i))
  b[i]++;
}
ll query(ll x){
  ll res=0;
  for(int i=x;i>0;i-=(i&-i))
  res+=b[i];
  return res;
}
ll calc(ll x){
  vii v;
  while(x!=1)
  v.pb(a[x]),x=pa[x];
  v.pb(a[1]);
  for(int i=0;i<=2*n;i++)
  b[i]=0;
  ll ans=0;
  for(auto it:v)
  update(it),ans+=query(it-1);
  return ans;
}
void change(ll x){
  ll z=a[x];
  while(x!=1)
  a[x]=z,x=pa[x];
  a[1]=z;
}
int main(){
  ios_base::sync_with_stdio(0),cin.tie(0);
  ll TC=1;
  //cin>>TC;
  while(TC--){
    cin>>n;
    for(int i=0;i<n;i++)
    cin>>C[i],mp[C[i]]=1;
    ll cnt=1;
    for(auto &it:mp)
    it.S=cnt++;
    for(int i=0;i<n;i++){
      a[i+1]=mp[C[i]];
    }
    for(int i=0;i<n-1;i++){
      ll x,y;
      cin>>x>>y;
      pa[y]=x;
      cout<<calc(x)<<'\n';
      change(y);
    }
  }
  return 0;
}
/*

*/

• Subtask 1: 7 / 7
• Subtask 2: 9 / 9
• Subtask 3: 0 / 84