Submission #110097

#	Time	Username	Problem	Language	Result	Execution time	Memory
110097		popovicirobert	Snake Escaping (JOI18_snake_escaping)	C++14	22 / 100	2041 ms	48108 KiB

snake_escaping

#include <bits/stdc++.h>
#define lsb(x) (x & (-x))
#define ll long long
#define ull unsigned long long
// 217
// 44

using namespace std;

int dp[1 << 20];

int main() {
    //ifstream cin("A.in");
    //ofstream cout("A.out");
    int i, l, q;
    ios::sync_with_stdio(false);
    cin.tie(0), cout.tie(0);

    cin >> l >> q;

    string str;
    cin >> str;

    for(int conf = 0; conf < (1 << l); conf++) {
        dp[conf] = str[conf] - '0';
    }
    for(int bit = 0; bit < l; bit++) {
        for(int conf = 0; conf < (1 << l); conf++) {
            if(conf & (1 << bit)) {
                dp[conf] += dp[conf ^ (1 << bit)];
            }
        }
    }

    unordered_map <int, int> mp;

    while(q > 0) {
        q--;

        string cur;
        cin >> cur;
        reverse(cur.begin(), cur.end());

        int num = 0, val = 0;
        for(i = 0; i < l; i++) {
            val *= 3;
            if(cur[i] == '?') {
                num++;
                val += 2;
            }
            else {
                val += cur[i] - '0';
            }
        }

        if(mp[val] > 0) {
            cout << mp[val] - 1 << "\n";
            continue;
        }

        vector <int> bit;

        if(num <= 10) {

            int ans = 0, cnf = 0;

            for(i = 0; i < l; i++) {
                if(cur[i] == '?') {
                    bit.push_back(i);
                }
                if(cur[i] == '1') {
                    cnf ^= (1 << i);
                }
            }

            int sz = bit.size();
            for(int conf = 0; conf < (1 << sz); conf++) {
                int aux = cnf;
                for(i = 0; i < sz; i++) {
                    if(conf & (1 << i)) {
                        aux += (1 << bit[i]);
                    }
                }
                ans += str[aux] - '0';
            }

            mp[val] = ans + 1;
            cout << ans << "\n";
        }
        else {

            ll ans = 0;
            int cnf = 0;

            for(i = 0; i < l; i++) {
                if(cur[i] == '1') {
                    bit.push_back(i);
                }
                if(cur[i] != '0') {
                    cnf ^= (1 << i);
                }
            }

            int sz = bit.size();
            for(int conf = 0; conf < (1 << sz); conf++) {

                int aux = cnf, cnt = 0;
                for(i = 0; i < sz; i++) {
                    if(conf & (1 << i)) {
                        aux ^= (1 << bit[i]);
                        cnt++;
                    }
                }

                if(cnt & 1) {
                    ans -= dp[aux];
                }
                else {
                    ans += dp[aux];
                }

            }

            mp[val] = ans + 1;
            cout << ans << "\n";
        }

    }

    //cin.close();
    //cout.close();
    return 0;
}

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