Submission #278809

#	Time	Username	Problem	Language	Result	Execution time	Memory
278809		ec1117	Traffic (IOI10_traffic)	C++17	0 / 100	20 ms	23808 KiB

traffic

#include "bits/stdc++.h"
#include "traffic.h"
using namespace std;

#define pb push_back
#define mp make_pair

typedef vector<int> vi;

vi adj[1000001];
long long sum[1000001];
int pars[1000001];

void dfs(int n, int par){
    pars[n]=par;
    for(int x:adj[n]){
        if(x!=par){
            dfs(x,n);
        }
        sum[n]+=sum[x];
    }
}

int LocateCentre(int n, int p[], int s[], int d[]){//int[] s?
    for(int i=0;i<n;i++){
        adj[s[i]].push_back(d[i]);
        adj[d[i]].push_back(s[i]);
    }
    for(int i=0;i<n;i++){
        sum[i]=p[i];
    }
    dfs(0,0);
    int ret=0;
    long long mins=LLONG_MAX;
    pars[0]=0;
    for(int i=0;i<n;i++){
        long long tmp=0;
        for(int j:adj[i]){
            if(j!=pars[i]+1) {
                tmp = max(tmp, sum[j]);
            }
        }
        tmp=max(tmp,sum[0]-sum[i]);
        if(tmp<mins){
            mins=tmp;
            ret=i;
        }
    }
    return ret;
}

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