Submission #982173

#	Time	Username	Problem	Language	Result	Execution time	Memory
982173		LOLOLO	Bootfall (IZhO17_bootfall)	C++17	100 / 100	225 ms	4772 KiB

bootfall

#include <bits/stdc++.h>
#define ll long long
using namespace std;
 
#define           f     first
#define           s     second
#define           pb    push_back
#define           ep    emplace
#define           eb    emplace_back
#define           lb    lower_bound
#define           ub    upper_bound
#define       all(x)    x.begin(), x.end()
#define      rall(x)    x.rbegin(), x.rend()
#define   uniquev(v)    sort(all(v)), (v).resize(unique(all(v)) - (v).begin())
#define     mem(f,x)    memset(f , x , sizeof(f))
#define        sz(x)    (int)(x).size()
#define  __lcm(a, b)    (1ll * ((a) / __gcd((a), (b))) * (b))
#define          mxx    *max_element
#define          mnn    *min_element
#define    cntbit(x)    __builtin_popcountll(x)
#define       len(x)    (int)(x.length())
 
const int N = 500 + 30;
const int M = (500 * 500 + 10);
int f[M + 10], f2[M + 10], cnt[M + 10], mod = 1e8 + 3;
int a[N];
 
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
 
    f[0] = 1;
 
    int sum = 0;
    int n;
    cin >> n;
 
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
        sum += a[i];
        for (int j = M; j >= a[i]; j--) {
            f[j] = (f[j] + f[j - a[i]]);
        }
    }
 
    if (sum % 2 == 0) {
        if (f[sum / 2] == 0) {
            cout << 0 << '\n';
            return 0;
        }
    }
 
    for (int i = 1; i <= n; i++) {
        for (int j = 0; j <= M; j++) {
            if (j >= a[i]) {
                f2[j] = (f[j] - f2[j - a[i]]);
            } else {
                f2[j] = f[j]; 
            }
        }
 
        int odd = (sum - a[i]) % 2;
        for (int j = odd; j <= M; j += 2) {
            int all = sum - a[i] + j;
            if (all % 2 == 0) {
                int h = all / 2;
                if (f2[h] != 0 || (h >= j && f2[h - j] != 0)) {
                    cnt[j]++;
                }
            }
        }
    }
 
    vector <int> save;
    for (int i = 1; i <= M; i++) 
        if (cnt[i] == n)
            save.pb(i);
 
    cout << sz(save) << '\n';
    for (auto x : save) 
        cout << x << " ";
 
    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