Submission #233911

#	Time	Username	Problem	Language	Result	Execution time	Memory
233911		anubhavdhar	Traffic (IOI10_traffic)	C++14	100 / 100	1278 ms	152824 KiB

traffic

#include<bits/stdc++.h>
#include "traffic.h"
 
#define ll long long int
#define pb push_back
#define mp make_pair
#define FOR(i,n) for(i=0;i<(n);++i)
#define FORe(i,n) for(i=1;i<=(n);++i)
#define FORr(i,a,b) for(i=(a);i<(b);++i)
#define FORrev(i,n) for(i=(n);i>=0;--i)
#define F0R(i,n) for(int i=0;i<(n);++i)
#define F0Re(i,n) for(int i=1;i<=(n);++i)
#define F0Rr(i,a,b) for(ll i=(a);i<(b);++i)
#define F0Rrev(i,n) for(int i=(n);i>=0;--i)
#define ii pair<ll,ll>
#define vi vector<ll>
#define vii vector<ii>
#define ff first 
#define ss second
#define cd complex<double>
#define vcd vector<cd>
#define ldd long double
#define dbgLine cout<<"Line : "<<__LINE__<<'\n'
#define all(x) (x).begin(),(x).end()
 
using namespace std;
/*
const short int __PRECISION = 10;
 
const ll MOD = 1e9+7;
const ll INF = 1e17 + 1101;
const ll LOGN = 17;
const ll MAXN = 1e6+5;
const ll ROOTN = 320;
 
const ldd PI = acos(-1);
const ldd EPS = 1e-7;*/
 
#define MAXN 1000006
#define INF 1000000000000017
 
vector<ll> g[MAXN];
ll People[MAXN], dp[MAXN], sum[MAXN], sm;
 
ll dfs(ll a, ll par)
{
	dp[a] = 0;
	sum[a] = People[a];
	for(ll b : g[a])
		if(b != par)
			dp[a] = max(dp[a], dfs(b, a)), sum[a] += sum[b];
	return sum[a];
}
 
int LocateCentre(int N, int* P, int* S, int* D)
{
	sm = 0;
	F0R(i, N)
		g[i].clear(), People[i] = P[i], sm += P[i];
	F0R(i, N-1)
	{
		g[S[i]].pb(D[i]);
		g[D[i]].pb(S[i]);
	}
	dfs(0, -1);
	ii mx = mp(INF, 0);
	F0R(i, N)
		mx = min(mx, mp(max(dp[i],sm - sum[i]),(ll) i));
	//cerr<<mx.ff<<' '<<mx.ss<<'\n';
	return mx.ss;
}
/*
int main()
{
 
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
 
	int N;
	cin>>N;
	int P[N], S[N], D[N];
	F0R(i, N)
		cin>>P[i];
	F0R(i, N-1)
		cin>>S[i]>>D[i];
	cout<<LocateCentre(N, P, S, D);
	return 0;
}*/

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