Submission #1278658

#	Time	Username	Problem	Language	Result	Execution time	Memory
1278658		wedonttalkanymore	Snake Escaping (JOI18_snake_escaping)	C++20	100 / 100	1655 ms	34320 KiB

snake_escaping

#include <bits/stdc++.h>
/*
    Wake up, I'm wake up
    Thu sang roi, em thay khong?
*/
using namespace std;
using ll = long long;

#define int long long
#define pii pair<ll, ll>
#define fi first
#define se second

const ll N = 2e5 + 5, inf = 1e18, mod = 1e9 + 7, block = 320, lim = 20;

int L, q, n;
string s;
int submask[1 << lim], supermask[1 << lim], sum[1 << lim];

void solve(string t) {
    int sz = t.size();
    reverse(t.begin(), t.end());
    int cnt0 = 0, cnt1 = 0, cntx = 0;
    int mask0 = 0, mask1 = 0, maskx = 0;
    for (int i = 0; i < sz; i++) {
        if (t[i] == '0') cnt0++, mask0 |= (1 << i);
        if (t[i] == '1') cnt1++, mask1 |= (1 << i);
        if (t[i] == '?') cntx++, maskx |= (1 << i);
    }
    if (cntx <= 6) {
        int res = 0;
        for (int sub = maskx; ; sub = (sub - 1) & maskx) {
            res += sum[mask1 | sub];
            if (sub == 0) break;
        }
        cout << res << '\n';
    }
    else if (cnt0 <= 6) {
        int res = 0;
        for (int sub = mask0; ; sub = (sub - 1) & mask0) {
            int tt = __builtin_popcountll(sub);
            if (tt % 2 == 0) res += supermask[sub | mask1];
            else res -= supermask[sub | mask1];
            if (sub == 0) break;
        }
        cout << res << '\n';
    }
    else {
        int res = 0;
        for (int sub = mask1; ; sub = (sub - 1) & mask1) {
            int tt = __builtin_popcountll(sub);
            int remain = cnt1 - tt;
            int sign = (remain % 2 == 0) ? 1 : -1;
            res += sign * submask[maskx | sub];
            if (sub == 0) break;
        }
        cout << res << '\n';
    }
}

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    if (fopen(".inp", "r")) {
        freopen(".inp", "r", stdin);
        freopen(".out", "w", stdout);
    }
    cin >> L >> q >> s;
    n = s.size();
    int allmask = 1 << L;
    for (int i = 0; i < allmask; i++) {
        sum[i] = submask[i] = supermask[i] = s[i] - '0';
    }
    for (int i = 0; i < L; i++) {
        for (int mask = 0; mask < allmask; mask++) {
            if (mask & (1 << i)) submask[mask] += submask[mask ^ (1 << i)];
        }
    }
    for (int i = 0; i < L; i++) {
        for (int mask = 0; mask < allmask; mask++) {
            if (!(mask & (1 << i))) supermask[mask] += supermask[mask | (1 << i)];
        }
    }
    for (int i = 1; i <= q; i++) {
        string t;
        cin >> t;
        solve(t);
    }
    return 0;
}

Compilation message (stderr)

snake_escaping.cpp: In function 'int main()':
snake_escaping.cpp:65:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |         freopen(".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~
snake_escaping.cpp:66:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |         freopen(".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~

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