Submission #943778

#	Time	Username	Problem	Language	Result	Execution time	Memory
943778		guechotjrhh	Snake Escaping (JOI18_snake_escaping)	C++14	75 / 100	2027 ms	36304 KiB

snake_escaping

#include<iostream>
#include<string>
using namespace std;

#include<map>
#include<string>
#include<algorithm>
#include<vector>
using namespace std;
#define all(x) x.begin(),x.end()
string str;
int n,p;
vector<int> zer, on;//sum of those i contains, sum of those contains me i
void init(int N, int Q, string S) {
	n = N; p = 1 << n;
	str = S;
	zer.resize(p); on.resize(p);
	for (int i = 0; i < p; i++) zer[i] = on[i] = S[i] - '0';
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < p; j++) {
			if (j & (1 << i)) zer[j] += zer[j - (1 << i)];
			else on[j] += on[j + (1 << i)];
		}
	}
	//for (int i = 0; i < p; i++) cout << i << ' ' << zer[i] << endl;
	//for (int i = 0; i < p; i++) cout << i << ' ' << on[i] << endl;
}
int ab(int x) { return x > 0 ? x : -x; }
int res;
void rec1(vector<int>& o, int i, int c, int x) {
	if (i == o.size()) {
		if (x & 1) res += zer[c];
		else res -= zer[c];
		return;
	}

	rec1(o, i + 1, c, x);
	rec1(o, i + 1, c + o[i], x+1);
}
void rec0(vector<int>& z, int i, int c, int x) {
	if (i == z.size()) {
		if (x & 1) res += on[c];
		else res -= on[c];
		return;
	}

	rec0(z, i + 1, c, x);
	rec0(z, i + 1, c + z[i], x + 1);
}
void recq(vector<int>& q, int i, int c) {
	if (i == q.size()) { res += str[c] - '0'; return; }
	recq(q, i + 1, c);
	recq(q, i + 1, c + q[i]);
}
int query(string A) {
	vector<int> ze, o, q;
	for (int i = 0; i < n; i++) {
		if (A[i] == '0') ze.push_back(1 << (n-1-i));
		else if (A[i] == '1') o.push_back(1 << (n-1-i));
		else q.push_back(1 << (n-1-i));
	}
/*
3 5
12345678
000
0??
1?0
?11
???
*/
	if (ze.size() > o.size() && q.size() > o.size()) {
		int c = 0;
		for (int i : q) c += i;
		res = 0;
		rec1(o, 0, c, 0);
		/*for (int i = 0; i < (1 << o.size()); i++) {
			int w = c, x=0;
			for (int j = 0; j < o.size(); j++) {
				if (i & (1 << j)) {
					w += o[j];
					x++;
				}
			}
			if (x & 1) res += zer[w];
			else res -= zer[w];
		}*/
		return ab(res);
	}
	else if(q.size() > ze.size()) {
		int c = 0;
		for (int i : o) c += i;
		res = 0;
		rec0(ze, 0, c, 0);
		/*for (int i = 0; i < (1 << ze.size()); i++) {
			int w = c, x = 0;
			for (int j = 0; j < ze.size(); j++) {
				if (i & (1 << j)) {
					w += ze[j];
					x++;
				}
			}
			if (x & 1) res += on[w];
			else res -= on[w];
		}*/
		return ab(res);
	}
	else {
		res = 0;
		int c = 0;
		for (int i : o) c += i;
		recq(q, 0, c);
		return res;
	}
	return 0;
}

int main() {
	ios::sync_with_stdio(0); cin.tie(0);
	int N, Q; cin >> N >> Q;
	string S; cin >> S;
	init(N, Q, move(S));
	
	for (int i = 0; i < Q; i++) {
		string A;
		cin >> A;
		cout << query(move(A)) << endl;
	}
}

Compilation message (stderr)

snake_escaping.cpp: In function 'void rec1(std::vector<int>&, int, int, int)':
snake_escaping.cpp:31:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |  if (i == o.size()) {
      |      ~~^~~~~~~~~~~
snake_escaping.cpp: In function 'void rec0(std::vector<int>&, int, int, int)':
snake_escaping.cpp:41:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |  if (i == z.size()) {
      |      ~~^~~~~~~~~~~
snake_escaping.cpp: In function 'void recq(std::vector<int>&, int, int)':
snake_escaping.cpp:51:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |  if (i == q.size()) { res += str[c] - '0'; return; }
      |      ~~^~~~~~~~~~~

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