"Re Rooting tree" Code Answer's
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Re Rooting tree
Rimuru Tempest
on May 13, 2021
#include<bits/stdc++.h>#define REP(i,n) for (int i = 1; i <= n; i++)#define mod 1000000007#define pb push_back#define ff first#define ss second#define ii pair<int,int>#define vi vector<int>#define vii vector<ii>#define lli long long int#define INF 1000000000#define endl '\n'const double PI = 3.141592653589793238460;typedef std::complex<double> Complex;typedef std::valarray<Complex> CArray;using namespace std; vi ar[200001];lli res[200001];int subSize[200001];lli subDist[200001];int n; void dfs1(int node , int par){ subSize[node] = 1; for(int child : ar[node]) if(child != par) { dfs1(child , node); subSize[node] += subSize[child]; subDist[node] += subSize[child] + subDist[child]; }} void dfs(int node , int par){ res[node] = res[par] - subSize[node] - subDist[node] + n - subSize[node] + subDist[node]; for(int child : ar[node]) if(child != par) dfs(child , node);} int main(){ int a , b; cin>>n; REP(i , n-1) cin>>a>>b , ar[a].pb(b) , ar[b].pb(a); dfs1(1 , -1); res[1] = subDist[1]; for(int child : ar[1]) dfs(child , 1); REP(i , n) cout<<res[i]<<" ";} Source: cses.fi
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