Submission #1062712

#	Time	Username	Problem	Language	Result	Execution time	Memory
1062712		armashka	Kpart (eJOI21_kpart)	C++17	10 / 100	2056 ms	472 KiB

Main

#include<bits/stdc++.h>

#pragma GCC target("avx2")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

using namespace std;

#define fast ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define file(s) freopen(s".in", "r", stdin);freopen(s".out", "w", stdout);
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define pb push_back
#define pf push_front
#define ppb pop_back
#define ft first
#define sd second
#define ll long long
#define ull unsigned ll
#define pii pair<int,int>
#define pll pair<ll,ll>
const int N = 1e6 + 10;
const int M = 1e6 + 5;
const int B = 316;
const ll msize = 2;
const ll mod1 = 1e9 + 7;
const ll mod2 = 998244353;
const long double Phi = acos(-1);
const long long inf = 2e9;
const vector <pair<int, int>> dir = {{-1, 0}, {1, 0}, {0, -1}, {0, 1}};

ll binmul(ll x, ll ti, ll m);
ll binpow(ll x, ll ti, ll m);

ll n, a[1005], pref[1005];
bitset<100005> bt;
bool used[1005];

const void solve() {
    cin >> n;
    for (int i = 1; i <= n; ++ i) cin >> a[i], pref[i] = pref[i - 1] + a[i], used[i] = 0;

    vector <int> ans;
    for (int k = 2; k <= n; ++ k) {
        if (used[k]) continue;
        int l = 1, r = k;

        // bt.reset();
        // bt[0] = 1;
        // for (int i = l; i <= r; ++ i) bt |= (bt << a[i]);

        bool ok = true;
        while (r <= n) {
            ll sum = pref[r] - pref[l - 1];
            if (sum % 2 == 0) {

                bt.reset();
                bt[0] = 1;
                for (int i = l; i <= r; ++ i)
                    bt |= (bt << a[i]);

                if (bt[sum / 2] == 0) {
                    ok = 0;
                    break;
                }

            } else {
                ok = 0;
                break;
            }
            ++ l; ++ r;

            // bt &= (bt >> a[l - 1]);
            // bt |= (bt << a[r]);
        }
        if (ok) {
            for (int i = k; i <= n; i += k) {
                used[i] = 1;
                ans.pb(i);
            }
        }
    }
    sort(all(ans));
    cout << ans.size() << " ";
    for (auto x : ans) cout << x << " ";
    cout << '\n';
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    srand(time(NULL));

    // file("promote");

    // freopen("input.txt", "r", stdin);
    // freopen("output.txt", "w", stdout);

    int tt = 1;
    cin >> tt;
    for (int i = 1; i <= tt; ++ i) {
        // cout << "Caso #" << i << "\n";
        // n = i;
        solve();
    }

    #ifndef ONLINE_JUDGE
    cerr << "\n" << 1.0 * clock() / CLOCKS_PER_SEC << " s.\n";
    #endif

    return 0;
}


// Template functions
ll binmul(ll x, ll ti, ll m) { ll res = 0;while (ti){if(ti & 1)res += x;x += x;ti >>= 1; x %= m; res %= m;} return res;}
ll binpow(ll x, ll ti, ll m) { ll res = 1;while (ti){if(ti & 1)(res *= x)%=m;(x*=x)%=m;ti >>= 1; x %= m; res %= m;} return res;}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 70