Submission #137118

#	Time	Username	Problem	Language	Result	Execution time	Memory
137118		meatrow	Bootfall (IZhO17_bootfall)	C++17	100 / 100	855 ms	2712 KiB

bootfall

#pragma GCC optimize("O3")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,tune=native")
//#pragma GCC optimize ("unroll-loops")
#include <bits/stdc++.h>

using namespace std;

using ll = long long;
using ld = long double;

const int N = 125001;

int main() {
    //freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout);
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    bitset<N> dp;
    int n;
    cin >> n;
    vector<int> a(n);
    int total = 0;
    dp.set(0);
    for (int& i : a) {
        cin >> i;
        total += i;
        dp |= dp << i;
    }
    if (total % 2 || !dp[total / 2]) {
        cout << 0;
        return 0;
    }
    vector<int> cnt(N * 2);
    bitset<N> kek;
    kek.set(0);
    for (int i = 0; i < n; i++) {
        dp = kek;
        for (int j = i + 1; j < n; j++) {
            dp |= dp << a[j];
        }
        kek |= kek << a[i];
        for (int j = 0; j * 2 < total - a[i]; j++) {
            cnt[abs(total - a[i] - 2 * j)] += dp[j];
        }
    }
    vector<int> ans;
    for (int i = 1; i < N * 2; i++) {
        if (cnt[i] == n) {
            ans.push_back(i);
        }
    }
    cout << ans.size() << '\n';
    for (int& i : ans) {
        cout << i << ' ';
    }
    return 0;
}

• Subtask 1: 6 / 6
• Subtask 2: 7 / 7
• Subtask 3: 15 / 15
• Subtask 4: 16 / 16
• Subtask 5: 21 / 21
• Subtask 6: 35 / 35