제출 #423503

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
423503		Theo830	친구 (IOI14_friend)	C++17	0 / 100	1076 ms	1996 KiB

friend

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll INF = 1e9;
ll MOD = 998244353;
typedef pair<ll,ll> ii;
#define iii pair<int,int>
#define f(i,a,b) for(ll i = a;i < b;i++)
#define pb push_back
#define vll vector<ll>
#define F first
#define S second
#define all(x) (x).begin(), (x).end()
///I hope I will get uprating and don't make mistakes
///I will never stop programming
///sqrt(-1) Love C++
///Please don't hack me
///@TheofanisOrfanou Theo830
///Think different approaches (bs,dp,greedy,graphs,shortest paths,mst)
///Stay Calm
///Look for special cases
///Beware of overflow and array bounds
///Think the problem backwards
///Training
vector<vll>adj;
ll arr[1005];
ll p[2] = {0};
void solve(ll idx,bool ep){
    p[ep]++;
    for(auto x:adj[idx]){
        if(x > idx){
            solve(x,ep^1);
        }
    }
}
int findSample(int n, int confidence[], int host[], int protocol[]){
    adj.assign(n+5,vll());
    ll ans = 0;
    f(i,0,n){
        arr[i] = confidence[i];
        ans += arr[i];
    }
    f(i,1,n){
        ll v = host[i];
        if(protocol[i] == 0){
            adj[v].pb(i);
            adj[i].pb(v);
        }
        else if(protocol[i] == 1){
            for(auto x:adj[v]){
                adj[i].pb(x);
                adj[x].pb(i);
            }
        }
        else{
            for(auto x:adj[v]){
                adj[i].pb(x);
                adj[x].pb(i);
            }
            adj[v].pb(i);
            adj[i].pb(v);
        }
    }
    solve(0,0);
    return max(p[0],p[1]);
}

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