Submission #42369

#	Time	Username	Problem	Language	Result	Execution time	Memory
42369		RezwanArefin01	Snake Escaping (JOI18_snake_escaping)	C++14	5 / 100	2044 ms	12836 KiB

snake_escaping

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> ii; 

ll dp[1 << 20]; 
string b;

int main(int argc, char const *argv[]) {
	int l, q; scanf("%d %d", &l, &q);
	cin >> b;
	for(int i = 0; i < (1 << l); i++) {
		dp[i] = b[i] - '0';
	}
	for(int i = 0; i < l; i++) {
		for(int j = 0; j < (1 << l); j++) {
			if(j >> i & 1) 
				dp[j] += dp[j ^ (1 << i)];
		}
	}
	while(q--) {
		string s; cin >> s; 
		int n0 = 0, n1 = 0, nw0t = 0; 
		for(char c : s) {
			n0 += c == '0';
			n1 += c == '1';
			nw0t += c == '?';
		}

		if(n1 == 0) {
			int num = 0;
			for(char c : s) num = (num << 1) + (c == '?');
			cout << dp[num] << endl;
		} else if(nw0t == 0) {
			int num = 0;
			for(char c : s) num = (num << 1) + (c == '1');
			cout << b[num] << endl;
		} else {
			vector<int> id;
			int basic = 0;

			for(int i = 0; i < s.size(); i++) {
				if(s[i] == '1') id.push_back(s.size() - 1 - i);
				if(s[i] == '?') s[i] = '1';
				basic = (basic << 1) + (s[i] == '1');
			} 
			ll ans = 0;
			for(int mask = 0; mask < (1 << id.size()); mask++) {
				int cnt = __builtin_popcount(mask); 
				int num = basic;
				for(int i = 0; i < id.size(); i++) {
					if(mask >> i & 1) num -= (1 << id[i]);
				}
				if(cnt & 1) ans -= dp[num];
				else ans += dp[num];


				//cout << bitset<4>(num).to_string() << endl;

			}
			cout << ans << endl;
		}
	}
}

Compilation message (stderr)

snake_escaping.cpp: In function 'int main(int, const char**)':
snake_escaping.cpp:43:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i = 0; i < s.size(); i++) {
                     ^
snake_escaping.cpp:52:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < id.size(); i++) {
                      ^
snake_escaping.cpp:11:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  int l, q; scanf("%d %d", &l, &q);
                                  ^

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