제출 #769234

#제출 시각아이디문제언어결과실행 시간메모리
769234Mohammad_ParsaConstruction of Highway (JOI18_construction)C++17
16 / 100
143 ms724 KiB
/* in the name of allah */ #include<bits/stdc++.h> using namespace std; //#define endl '\n' #define pb push_back #define F first #define S second #define mk make_pair typedef long long ll; const int N=4e3+7; int n,c[N],a[N],b[N],ans[N],p[N],x[N],fen[N]; pair<int,int>com[N]; void upd(int i,int x){ for(;i<N;i+=i&(-i)){ fen[i]+=x; } } int get(int i){ int ans=0; for(;i;i-=i&(-i)){ ans+=fen[i]; } return ans; } int main(){ ios:: sync_with_stdio(0),cin.tie(0),cout.tie(0); cin>>n; for(int i=1;i<=n;i++){ cin>>c[i]; com[i]=mk(c[i],i); } int k=1; sort(com,com+n+1); for(int i=1;i<=n;i++){ c[com[i].S]=k; if(com[i].F!=com[i+1].F)k++; } for(int i=0;i<n-1;i++){ cin>>a[i]>>b[i]; p[b[i]]=a[i]; } x[1]=1; for(int i=0;i<n-1;i++){ int u=a[i]; x[b[i]]=b[i]; while(u!=0){ ans[i]+=get(c[x[u]]-1); upd(c[x[u]],1); x[u]=b[i]; u=p[u]; } fill(fen,fen+N,0); cout<<ans[i]<<endl; } }
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