제출 #1254775

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1254775		thdh__	Bitaro’s Party (JOI18_bitaro)	C++20	14 / 100	2106 ms	418448 KiB

bitaro

#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define eb emplace_back
#define pu push
#define ins insert
#define fi first
#define se second
#define all(a) a.begin(),a.end()
#define bruh ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define fu(x,a,b) for (auto x=a;x<=b;x++)
#define fd(x,a,b) for (auto x=a;x>=b;x--)
#define int ll

using namespace std;
//mt19937 mt(chrono::steady_clock::now().time_since_epoch().count());

/*
Competitive Programming notes that I need to study & fix my dumbass self:

1. Coding:
- Always be sure to check the memory of arrays (maybe use vectors), for loops
- Always try to maximize the memory if possible, even if you are going for subtasks
- Do not exploit #define int long long, it will kill you

2. Stress: 
- Always try generating big testcases and try if they run

3. Time management:
- Don't overcommit or undercommit, always spend a certain amount of time to think a problem, don't just look at it and say I'm fucked
- Do not spend too much time coding brute-force solutions, they should be easily-codable solutions that don't take up too much time

Time management schedule:
Offline / LAH days (4 problems - 3h):
15' thinking of solution / idea
1. no idea: skip
2. yes idea: continue thinking for <= 15'

+ implementing: <= 20'
+ brute-force: <= 5'
+ test generator: <= 5'

I hate offline because I am dumb
*/

typedef pair<int, int> ii;
const int N = 2e5+5;
const int block = 150;
const int mod = 1e9+7;
const int inf = 1e18;
using cd = complex<double>;
const long double PI = acos(-1);
int power(int a,int b) {ll x = 1;if (a >= mod) a%=mod; while (b) {if (b & 1) x = x*a % mod;a = a*a % mod;b>>=1;}return x;} 

int n,m,q;
vector<int> adj[N];
vector<ii> a[N];
int id[N], c[N];
bool check[N];
int dp[N];

void solve()
{
	cin>>n>>m>>q;
	for (int i = 1; i <= m; i++) 
	{
		int u,v; cin>>u>>v;
		adj[v].pb(u);
	}
	for (int i = 1; i <= n; i++) 
	{
		priority_queue<ii> pq;
		for (auto v : adj[i]) pq.push({a[v][0].fi, v});
		while (!pq.empty() && a[i].size() < block) 
		{
			int dist = pq.top().fi, v = pq.top().se;
			pq.pop();
			a[i].pb({dist+1, a[v][id[v]].se});
			id[v]++;
			if (id[v] < a[v].size()) pq.push({a[v][id[v]].fi, v});
		}
		if (a[i].size() < block) a[i].pb({0, i});
		for (auto v : adj[i]) id[v] = 0;
	}
	while (q--) 
	{
		int t, k;
		cin>>t>>k;
		for (int i = 0; i < k; i++) cin>>c[i], check[c[i]] = 1;
		bool has = 0;
		for (auto i : a[t]) 
		{	
			if (!check[i.se]) 
			{
				cout<<i.fi<<endl;
				has = 1;
				break;
			}
		}
		if (!has) 
		{
			for (int i = 1; i <= n; i++) dp[i] = -inf;
			dp[t] = 0;
			int ans = -1;
			for (int i = t; i >= 1; i--) 
			{
				if (dp[i] == -inf) continue;
				for (auto j : adj[i]) dp[j] = max(dp[j], dp[i]+1);
				if (!check[i]) ans = max(ans, dp[i]);
			}
			if (ans == -1) cout<<-1<<endl;
			else cout<<ans<<endl;
		}
		for (int i = 0; i < k; i++) check[c[i]] = 0;
	}
}

/*
Go through the mistakes you usually make and revise your code, for god's sake...
*/

signed main()
{
	bruh
	//freopen("input.inp","r",stdin);
	//freopen("output.inp","w",stdout);
	int t = 1;
	// cin>>t;
	while (t--)
	{
		solve();
		cout<<"\n";
	}
}

• Subtask 1: 7 / 7
• Subtask 2: 7 / 7
• Subtask 3: 0 / 86