Submission #1115216

#	Time	Username	Problem	Language	Result	Execution time	Memory
1115216		Dan4Life	Snake Escaping (JOI18_snake_escaping)	C++17	0 / 100	2063 ms	8784 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 B2 = 20-B1;
const int N1 = (1<<B1)+10;
const int N2 = (1<<B2)+2;
const int M1 = 2190;
const int M2 = 1594325;
vector<array<int,2>> v, w[N1];
string s;
bitset<N1+10> submask[M1];
int l, q, ans[M2], dp[M2];
int p3[] = {1,3,9,27,81,243,729,729*3,729*9};

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;
	while(lol){
		int r = lol%2; lol/=2;
		ans+=r*p; p*=3;
	}
	return ans;
}
 
int32_t main(){
	ios_base::sync_with_stdio(false); cin.tie(0);
	cin >> l >> q >> s;
	for(int i = 0; i < M1; i++){
		for(int j = 0; j < N1; j++){
			int ok = 1, cur = i, cur2 = j;
			for(int k = 0; k < B1; k++){
				int t = cur%3, t2=cur2%2; cur/=3; cur2/=2;
				if(t==2 or t==t2) continue; ok=0; break;
			}
			if(ok) submask[i][j]=1;
		}
	}
	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; _ < N1-9; _++){
		memset(dp,0,sizeof(dp));
		for(auto [xd,sc] : w[_]) dp[xd]=sc;
		for(int j = 0; j < 7; j++)
			for(int i = 0; i < M2; i++)
				if((i/p3[j])%3==2) dp[i]+=dp[i-p3[j]]+dp[i-2*p3[j]];
		for(int i = 0; i < q; i++){
			auto [x,y] = v[i];
			if(submask[x][_]) 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:46:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   46 |     if(t==2 or t==t2) continue; ok=0; break;
      |     ^~
snake_escaping.cpp:46:33: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   46 |     if(t==2 or t==t2) continue; ok=0; break;
      |                                 ^~

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