Submission #1012975

#	Time	Username	Problem	Language	Result	Execution time	Memory
1012975		huutuan	Traffic (IOI10_traffic)	C++14	0 / 100	6 ms	29332 KiB

traffic

#include "traffic.h"

#include <bits/stdc++.h>

using namespace std;

const int N=1e6+10;
int n, a[N], sz[N];
vector<int> g[N];

void dfs_sz(int u, int p){
   sz[u]=a[u];
   for (int v:g[u]) if (v!=p){
      dfs_sz(v, u);
      sz[u]+=sz[v];
   }
}

int find_centroid(int u, int p, int s){
   for (int v:g[u]) if (v!=p && sz[v]*2>s) return find_centroid(v, u, s);
   return u;
}

int LocateCentre(int _N, int pp[], int S[], int D[]) {
   n=_N;
   for (int i=0; i<n; ++i) a[i]=pp[i];
   for (int i=0; i<n-1; ++i){
      g[S[i]].push_back(D[i]);
      g[D[i]].push_back(S[i]);
   }
   dfs_sz(0, -1);
   int u=find_centroid(0, -1, sz[0]);
   dfs_sz(u, -1);
   for (int i=0; i<n; ++i) g[i].clear();
   return u;
}

• Subtask 1: 0 / 25
• Subtask 2: 0 / 25
• Subtask 3: 0 / 25
• Subtask 4: 0 / 25