Submission #489401

#	Time	Username	Problem	Language	Result	Execution time	Memory
489401		arwaeystoamneg	Snake Escaping (JOI18_snake_escaping)	C++17	75 / 100	2084 ms	23072 KiB

snake_escaping

// EXPLOSION!
#define _CRT_SECURE_NO_WARNINGS
#include<bits/stdc++.h>
#include<unordered_set>
#include<unordered_map>
#include<chrono>

using namespace std;
typedef pair<int, int> pii;
typedef long long ll;
typedef pair<ll, ll> pll;
typedef long double ld;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<pair<int, int>> vpi;
typedef vector<pair<ll, ll>> vpll;

#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define trav(a,x) for (auto& a: x)

#define pb push_back
#define mp make_pair
#define rsz resize
#define sz(x) int(x.size())
#define all(x) x.begin(),x.end()
#define f first
#define s second
#define cont continue
//#define endl '\n'
//#define ednl '\n'
#define test int testc;cin>>testc;while(testc--)
#define pr(a, b) trav(x,a)cerr << x << b; cerr << endl;
#define message cout << "Hello World" << endl;
const int dx[4] = { 1,0,-1,0 }, dy[4] = { 0,1,0,-1 }; // for every grid problem!!
const ll linf = 4000000000000000000LL;
const ll inf = 1000000007;//998244353    

void pv(vi a) { trav(x, a)cout << x << " "; cout << endl; }void pv(vll a) { trav(x, a)cout << x << " "; cout << endl; }void pv(vector<vi>a) {
	F0R(i, sz(a)) { cout << i << endl; pv(a[i]); cout << endl; }
}void pv(vector<vll>a) { F0R(i, sz(a)) { cout << i << endl; pv(a[i]); }cout << endl; }void pv(vector<string>a) { trav(x, a)cout << x << endl; cout << endl; }
void setIO(string s) {
	ios_base::sync_with_stdio(0); cin.tie(0);
#ifdef arwaeystoamneg
	if (sz(s))
	{
		freopen((s + ".in").c_str(), "r", stdin);
		if (s != "test1")
			freopen((s + ".out").c_str(), "w", stdout);
	}
#endif
}
int popcount(ll a)
{
	int count = 0;
	while (a)
	{
		count += (a & 1);
		a >>= 1;
	}
	return count;
}
const int SZ = 20;
int n, q;
string a;
ll super[1 << SZ], sub[1 << SZ];
int main()
{
	setIO("test1");
	cin >> n >> q >> a;
	F0R(mask, 1 << n)
	{
		sub[mask] = super[mask] = a[mask] - '0';
	}
	F0R(i, n)
	{
		F0R(mask, 1 << n)
		{
			if (mask & (1 << i))continue;
			sub[mask ^ (1 << i)] += sub[mask];
		}
	}
	F0R(i, n)
	{
		R0F(mask, 1 << n)
		{
			if (mask & (1 << i))
			{
				super[mask ^ (1 << i)] += super[mask];
			}
		}
	}
	F0R(l, q)
	{
		string b;
		cin >> b;
		reverse(all(b));
		vi zero, one, quest;
		F0R(i, n)if (b[i] == '0')zero.pb(i); else if (b[i] == '1')one.pb(i); else quest.pb(i);
			ll ans = 0;
			
		if (sz(zero) <= n / 3)
		{
			int mask1 = 0;
			trav(x, one)mask1 ^= (1 << x);
			int m = sz(zero);
			int cur = mask1;
			F0R(mask, 1 << m)
			{
				if (popcount(mask) & 1)ans -= super[cur];
				else ans += super[cur];
				int t = 0;
				while (t < m)
				{
					if (cur & (1 << zero[t]))
					{
						cur ^= (1 << zero[t]);
						t++;
					}
					else
					{
						cur ^= (1 << zero[t]);
						break;
					}
				}
			}

		}
		else if (sz(one) <= n / 3)
		{
			int mask1 = 0;
			trav(x, quest)mask1 ^= (1 << x);
			int m = sz(one);
			int cur = mask1;
			F0R(mask, 1 << m)
			{
				if (popcount(mask) & 1)ans -= sub[cur];
				else ans += sub[cur];
				int t = 0;
				while (t < m)
				{
					if (cur & (1 << one[t]))
					{
						cur ^= (1 << one[t]);
						t++;
					}
					else
					{
						cur ^= (1 << one[t]);
						break;
					}
				}
			}

		}
		else
		{
			int mask1 = 0;
			trav(x, one)mask1 ^= (1 << x);
			int m = sz(quest);
			int cur = mask1;
			F0R(mask, 1 << m)
			{

				int t = 0;
				while (t < m)
				{
					if (cur & (1 << quest[t]))
					{
						cur ^= (1 << quest[t]);
						t++;
					}
					else
					{
						cur ^= (1 << quest[t]);
						break;
					}
				}
				ans += a[cur] - '0';
			}
		}
		cout << abs(ans) << endl;
	}
}

• Subtask 1: 5 / 5
• Subtask 2: 7 / 7
• Subtask 3: 10 / 10
• Subtask 4: 53 / 53
• Subtask 5: 0 / 25