Submission #792475

#	Time	Username	Problem	Language	Result	Execution time	Memory
792475		Cookie	Snake Escaping (JOI18_snake_escaping)	C++14	100 / 100	1049 ms	43388 KiB

snake_escaping

#include<bits/stdc++.h>
#include<fstream>
#pragma GCC optimize("Ofast,O3,unroll-loops")
#pragma GCC target("avx2")
using namespace std;
//ifstream fin("FEEDING.INP");
//ofstream fout("FEEDING.OUT");
#define sz(a) (int)a.size()
#define ll long long
#define pb push_back
#define forr(i, a, b) for(int i = a; i < b; i++)
#define dorr(i, a, b) for(int i = a; i >= b; i--)
#define ld long double
#define vt vector
#include<fstream>
#define fi first
#define se second
#define pll pair<ll, ll>
#define pii pair<int, int>
const ll mxn = 3e5 + 5, base = 972663749;
const ll mod = 911382323, mxv = 1e9 + 1, inf = 2e9;
int l, q;
int big[(1 << 21)], small[(1 << 21)], cnt[(1 << 20)];
string s;
signed main()
{
     ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); 
    cin >> l >> q;
    cin >> s;
    for(int i = 0; i < (1 << l); i++){
        cnt[i] = __builtin_popcount(i);
        big[i] = (s[i] - '0'); small[i] = (s[i] - '0');
    }
    for(int i = 0; i < l; i++){
        for(int j = 0; j < (1 << l); j++){
            if(j & (1 << i))small[j] += small[j ^ (1 << i)];
            else big[j] += big[j ^ (1 << i)];
        }
    }
    
    
    while(q--){
       
       char c;
        int zero = 0, one = 0, que = 0;
        for(int i = 0; i < l; i++){
            cin >> c;
            if(c == '0')zero += (1 << (l - i - 1));
            else if(c == '1')one += (1 << (l - i - 1));
            else que += (1 << (l - i - 1));
        }
        int ans = 0;
        if(__builtin_popcount(que) <= 6){
            int mask = one;
            for(int j = que;j; j = (j - 1) & que){
                //cout << (mask | j) << " ";
                ans += (s[mask | j] - '0');
                
            }
            ans += (s[mask] - '0');
        }else if(__builtin_popcount(one) <= 6){
            int mask = que;
            for(int j = one;j; j = (j - 1) & one){
                if((cnt[one] - cnt[j]) & 1)ans -= small[mask | j];
                else ans += small[mask | j];
               
            }
            if(cnt[one] & 1)ans -= small[mask];
            else ans += small[mask];
        }else{
            int mask = one;
            for(int j = zero;j; j = (j - 1) & zero){
                if(cnt[j] & 1)ans -= big[mask | j];
                else ans += big[mask | j];
            }
            ans += big[mask];
        }
        cout << ans << "\n";
    }
    return(0);
}

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