Submission #519444

#	Time	Username	Problem	Language	Result	Execution time	Memory
519444		Keshi	L-triominoes (CEOI21_ltriominoes)	C++17	0 / 100	1 ms	460 KiB

ltrominoes

//In the name of God
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const ll maxn = 2e5 + 100;
const ll mod = 1e9 + 7;
const ll inf = 1e18;

#define fast_io ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define file_io freopen("input.txt", "r+", stdin);freopen("output.txt", "w+", stdout);
#define pb push_back
#define Mp make_pair
#define F first
#define S second
#define Sz(x) ll((x).size())
#define all(x) (x).begin(), (x).end()

ll pw(ll a, ll b){
	ll c = 1;
	while(b){
		if(b & 1) c = c * a % mod;
		a = a * a % mod;
		b >>= 1;
	}
	return c;
}


vector<int> merge(vector<int> a, vector<int> b){
	for(int i : b){
		a.pb(i);
	}
	return a;
}
vector<int> get(int x, int t){
	if(x == 0) return vector<int>(1, ((t & 1) ? 7 : x));
	if(x == 7) return vector<int>(1, ((t & 1) ? 0 : x));
	if(x == 3) return vector<int>(1, ((t & 1) ? 6 : x));
	if(x == 6) return vector<int>(1, ((t & 1) ? 3 : x));
	if(x == 1) return vector<int>(1, ((t & 1) ? 4 : x));
	if(x == 4) return vector<int>(1, ((t & 1) ? 1 : x));
	if(x == 2) return vector<int>(0);
	vector<int> vec;
	vec.pb(3);
	vec.pb(6);
	return vec;
}
int n, m, k;
pii a[maxn];
map<int, int> mp;
vector<int> vec, b;


int main(){
	fast_io;
	
	cin >> n >> m >> k;
	swap(n, m);
	assert(m == 3);
	for(int i = 0; i < k; i++){
		cin >> a[i].F >> a[i].S;
		swap(a[i].F, a[i].S);
		vec.pb(a[i].F);
		mp[a[i].F] |= (1 << (a[i].S - 1));
	}
	vec.pb(1);
	vec.pb(n + 1);
	sort(all(vec));
	vec.resize(unique(all(vec)) - vec.begin());
	b.pb(0);
	for(int i = 0; i + 1 < Sz(vec); i++){
		vector<int> bb;
		for(int j : b){
			if((j & mp[vec[i]])) continue;
			//cout << "^ " << j << " " << (j | mp[vec[i]]) << "\n";
			bb = merge(bb, get(j | mp[vec[i]], vec[i + 1] - vec[i]));
		}
		b = bb;
	/*	cout << "# " << vec[i] << " -> ";
		for(int j : b){
			cout << j << " ";
		}
		cout << "\n";*/
	}
	for(int i : b){
//		cout << i << " ";
		if(i == 0){
			cout << "YES\n";
			return 0;
		}
	}
	cout << "NO\n";
	
	return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 7
• Subtask 3: 0 / 11
• Subtask 4: 0 / 17
• Subtask 5: 0 / 35
• Subtask 6: 0 / 20