Submission #1114780

#	Time	Username	Problem	Language	Result	Execution time	Memory
1114780		Dan4Life	Snake Escaping (JOI18_snake_escaping)	C++17	5 / 100	2005 ms	24528 KiB

snake_escaping

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) begin(a),end(a)

const int B1 = 7;
const int N = 1<<B1;
vector<array<int,2>> v, w[N];
string s;
int l, q, ans[1000010], dp[1594324];

int calc(string lol){
	int p = 1, ans = 0, xd;
	for(int i = 0; i < sz(lol); i++){
		if(lol[i]=='?') xd=2;
		else xd = lol[i]-'0';
		ans+=xd*p, p*=3;
	}
	return ans;
}

int calc(int lol){
	int p = 1, ans = 0;
	for(int i = 0; i < B1; i++)
		ans+=(lol>>i&1)*p, p*=3;
	return ans;
}

int submask(int x, int y){
	for(int i = 0; i < 20; i++,x/=3, y/=3){
		int r1 = x%3, r2 = y%3;
		if(r1==2) continue;
		if(r1!=r2) return false;
	}
	return true;
}
int32_t main(){
	ios_base::sync_with_stdio(false); cin.tie(0);
	cin >> l >> q >> s;
	for(int mask = 0; mask < (1<<l); mask++){
		int m1 = 0, m2 = mask;
		if(l>B1) m1 = mask&((1<<B1)-1), m2>>=B1;
		w[m1].pb({calc(m2),s[mask]-'0'});
	}
	for(int i = 0; i < q; i++){
		string t; cin >> t; 
		reverse(all(t)); string x="";
		if(l>B1) x = t.substr(0,B1),t=t.substr(B1);
		v.pb({calc(x),calc(t)});
	}
	for(int _ = 0; _ < N; _++){
		if(!sz(v[_])) continue;
		memset(dp,0,sizeof(dp));
		for(auto [xd,sc] : w[_]) dp[xd]+=sc;
		for(int i = 0; i < 1594324; i++){
			int xd = i, p = 1, ok = 0;
			while(xd){
				int r = xd%3;
				if(r==2) {
					dp[i]+=dp[i-2*p]+dp[i-p];
					ok = 1;
					break;
				}
				xd/=3; p*=3;
			}
		}
		int z = calc(_);
		for(int i = 0; i < q; i++){
			auto [x,y] = v[i];
			if(submask(x,z)) ans[i]+=dp[y];
		}
	}
	for(int i = 0; i < q; i++) cout << ans[i] << "\n";
}

Compilation message (stderr)

snake_escaping.cpp: In function 'int32_t main()':
snake_escaping.cpp:57:23: warning: variable 'ok' set but not used [-Wunused-but-set-variable]
   57 |    int xd = i, p = 1, ok = 0;
      |                       ^~

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