Submission #1048173

#	Time	Username	Problem	Language	Result	Execution time	Memory
1048173		khanhtb	Snake Escaping (JOI18_snake_escaping)	C++14	100 / 100	403 ms	46416 KiB

snake_escaping

#pragma GCC optimize("O3,unroll-loops")
#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define ld long double
#define pb push_back
#define pf push_front
#define vi vector<ll>
#define vii vector<vi>
#define pll pair<ll, ll>
#define vpll vector<pll>
#define all(a) a.begin(), a.end()
#define fi first
#define se second
using namespace std;
const int mod = 998244353; 
const ll inf = 2e18;
const int B = 320;
const int N = 2e6+8;
int n,q,a[N];
int sub[N],sup[N];
void solve(){
    cin >> n >> q;
    for(int i = 0; i < 1<<n; i++){
        char c;cin >> c;
        a[i] = c-'0';
        sub[i] = sup[i] = a[i];
    }
    for(int i = 0; i < n; i++){
        for(int mask = 0; mask < 1<<n; mask++){
            if(mask>>i&1) sub[mask] += sub[mask^(1<<i)];
            else sup[mask] += sup[mask^(1<<i)];
        }
    }
    while(q--){
        string t;cin >> t;
        int mask[3] = {0};
        int cnt[3] = {0};
        reverse(all(t));
        for(int i = 0; i < t.size(); i++){
            int type;
            if(t[i] == '0') type = 0;
            else if(t[i] == '1') type = 1;
            else type = 2;
            cnt[type]++;
            mask[type] |= (1<<i);
        }
        int ans = 0;
        if(cnt[2] <= 7){
            for(int m = mask[2]; ; m = (m-1)&mask[2]){
                ans += a[mask[1]|m];
                if(m == 0) break;
            }
            cout << ans << '\n';
        }
        else if(cnt[1] <= 7){
            for(int m = mask[1]; ; m = (m-1)&mask[1]){
                if(__builtin_popcount(m)&1) ans -= sub[(m ^ mask[1]) | mask[2]];
                else ans += sub[(m ^ mask[1]) | mask[2]];
                if(m == 0) break;
            }
            cout << ans << '\n';
        }
        else{
            for(int m = mask[0]; ; m = (m-1)&mask[0]){
                if(__builtin_popcount(m)&1) ans -= sup[m | mask[1]];
                else ans += sup[m | mask[1]];
                if(m == 0) break;
            }
            cout << ans << '\n';
        }
    }
}
signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    if (fopen("test.inp", "r")) {
        freopen("test.inp", "r", stdin);
        freopen("test.out", "w", stdout);
    }   
    ll T = 1;
    // cin >> T;
    for (ll i = 1; i <= T; i++) {
        solve();
        cout << '\n';
    }
}

Compilation message (stderr)

snake_escaping.cpp: In function 'void solve()':
snake_escaping.cpp:40:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |         for(int i = 0; i < t.size(); i++){
      |                        ~~^~~~~~~~~~
snake_escaping.cpp: In function 'int main()':
snake_escaping.cpp:79:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   79 |         freopen("test.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
snake_escaping.cpp:80:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |         freopen("test.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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