제출 #315401

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
315401		aZvezda	Snake Escaping (JOI18_snake_escaping)	C++14	5 / 100	2090 ms	65540 KiB

snake_escaping

#include <bits/stdc++.h>
using namespace std;
//#pragma GCC optimize ("O3")
//#pragma GCC target ("sse4")
#define endl "\n"
typedef long long ll;
template<class T, class T2> inline ostream &operator <<(ostream &out, const pair<T, T2> &x) { out << x.first << " " << x.second; return out;}
template<class T, class T2> inline istream &operator >>(istream &in, pair<T, T2> &x) { in >> x.first >> x.second; return in;}
template<class T, class T2> inline bool chkmax(T &x, const T2 &y) { return x < y ? x = y, 1 : 0; }
template<class T, class T2> inline bool chkmin(T &x, const T2 &y) { return x > y ? x = y, 1 : 0; }
const ll mod = 1e9 + 7;
#define out(x) "{" << (#x) << ": " << x << "} "

const ll MAX_N = 1 << 20;
const ll MAX_RIGHT = 1600000; ll MAX_LEFT = 7;
ll pow3[MAX_N];
ll dp[MAX_RIGHT];
ll price[MAX_N];
string queries[MAX_N];
ll ans[MAX_N];
ll n, q;

vector<ll> toTernary(ll x) {
	vector<ll> ret;
	for(ll i = 0; i < n - MAX_LEFT; i ++) {
		ret.push_back(x % 3);
		x /= 3;
	}
	return ret;
}

void getAns(ll mask) {
	//cout << "Getting " << mask << endl;	
	vector<ll> indices;
	for(ll i = 0; i < q; i ++) {
		for(ll j = 0; j < MAX_LEFT; j ++) {
			if(mask & (1 << j)) {
				if(queries[i][j] == '0') {
					break;
				}
			} else {
				if(queries[i][j] == '1') {
					break;
				}				
			}
			if(j == MAX_LEFT - 1) {
				indices.push_back(i);
			}
		}
	}
	
	ll triBits = n - MAX_LEFT;
	for(ll i = 0; i < pow3[n - MAX_LEFT]; i ++) {
		vector<ll> tern = toTernary(i);
		bool flag = false;
		for(ll j = 0; j < tern.size(); j ++) {
			if(tern[j] == 2) {
				dp[i] = dp[i - pow3[j]] + dp[i - 2 * pow3[j]]; 
				flag = true;
				break;
			}
		}
		if(!flag) {
			ll currMask = mask;
			for(ll j = 0; j < tern.size(); j ++) {
				currMask += tern[j] * (1 << (j + MAX_LEFT));
			}
			dp[i] = price[currMask];
		}
		continue;
		cout << "Testing " << i << endl;
		for(auto it : tern) {
			cout << it;
		}
		cout << endl;
		cout << i << " " << dp[i] << endl;
	}
	
	for(auto it : indices) {
		ll currMask = 0;
		for(ll j = n - 1; j >= MAX_LEFT; j --) {
			currMask *= 3;
			currMask += (ll)(queries[it][j] - '0');
		}
		//cout << it << " " << out(dp[currMask]) << " " << currMask << endl;
		ans[it] += dp[currMask];
	}
}

signed main() {
	ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
	pow3[0] = 1;
	for(ll i = 1; i < MAX_N; i ++) {
		pow3[i] = pow3[i - 1] * 3;
	}
	cin >> n >> q;
	chkmin(MAX_LEFT, n);
	string in;
	cin >> in;
	for(ll i = 0; i < (1 << n); i ++) {
		price[i] = in[i] - '0';
	}
	for(ll i = 0; i < q; i ++) {
		cin >> queries[i];
		reverse(queries[i].begin(), queries[i].end());
		for(auto &it : queries[i]) {
			if(it == '?') {
				it = '2';
			}
		}
	}
	for(ll mask = 0; mask < (1 << MAX_LEFT); mask ++) {
		getAns(mask);
	}
	for(ll i = 0; i < q; i ++) {
		cout << ans[i] << endl;
	}
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

snake_escaping.cpp: In function 'void getAns(ll)':
snake_escaping.cpp:56:19: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   56 |   for(ll j = 0; j < tern.size(); j ++) {
      |                 ~~^~~~~~~~~~~~~
snake_escaping.cpp:65:20: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   65 |    for(ll j = 0; j < tern.size(); j ++) {
      |                  ~~^~~~~~~~~~~~~
snake_escaping.cpp:52:5: warning: unused variable 'triBits' [-Wunused-variable]
   52 |  ll triBits = n - MAX_LEFT;
      |     ^~~~~~~

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