Submission #675764

#	Time	Username	Problem	Language	Result	Execution time	Memory
675764		VodkaInTheJar	Packing Biscuits (IOI20_biscuits)	C++14	9 / 100	20 ms	836 KiB

biscuits

#include <bits/stdc++.h>
#pragma GCC optimize("O3")
#define endl '\n'

using namespace std;

long long pr[62];
unordered_map <long long, long long> dp[62];
long long f(int pos, long long sm, long long x) {
    if (sm < 0)
        return 0;

    if (pos == -1 || sm == 0)
        return 1; 

    sm = min(sm, (1ll << (pos + 1)) - 1);
    if (dp[pos].count(sm))
        return dp[pos][sm];

    long long ans = f(pos-1, sm, x);

    if (pr[pos] - (x << pos) >= 0) {
        long long sm1 = min(sm - (1 << pos), (pr[pos] - (x << pos)) / x);
        ans += f(pos-1, sm1, x);
    }

    return dp[pos][sm] = ans; 
}

long long count_tastiness(long long x, vector <long long> a) {
    pr[0] = a[0];
    for (int i = 1; i <= 61; i++) {
        pr[i] = pr[i-1];
        if (i < (int)a.size())
            pr[i] += (1ll << i) * a[i];
    }

    long long last = 0;
    for (int i = 0; i <= 61; i++)
        if ((x << i) > pr[61]) {
            last = i-1;
            break;
        }

    for (int i = 0; i <= last; i++)
        dp[i].clear();

    return f(last, (1ll << 61), x);
}

/*
int main() {
    long long n, x;
    cin >> x >> n;

    vector <long long> v(n);
    for (int i = 0; i < n; i++)
        cin >> v[i];

    cout << count_tastiness(x, v) << endl;
}
*/

• Subtask 1: 9 / 9
• Subtask 2: 0 / 12
• Subtask 3: 0 / 21
• Subtask 4: 0 / 35
• Subtask 5: 0 / 23