Submission #1282285

#	Time	Username	Problem	Language	Result	Execution time	Memory
1282285		Hurryup_7735	Bootfall (IZhO17_bootfall)	C++20	13 / 100	1095 ms	16004 KiB

bootfall

//In The Name Of ALLAH!
#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp> 
#include <ext/pb_ds/tree_policy.hpp> 
 
using namespace __gnu_pbds;
using namespace std;
 
#define ll long long
#define ld long double
#define endl '\n'
#define pb push_back
#define pf push_front
#define Zemur007 ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define bpc __builtin_popcountll
#define btz __builtin_ctzll
#define all(x) x.begin() , x.end()
#define allr(x) x.rbegin() , x.rend()
#define F first
#define S second
#define pll pair<ll , ll>
#define turtle tuple<ll , ll , ll>
#define pss pair<string , string>
#define YES cout << "YES" << endl;
#define NO cout << "NO" << endl;
#define indexed_set tree<pll , null_type , less<pll> , rb_tree_tag , tree_order_statistics_node_update>


const ll sz = 5e2 + 5 , INF = 1e18 ,  MOD = 1e9 + 7;
ll a[sz];
unordered_map<ll , bool> dp;
map<ll , ll> pref[sz] , suff[sz];

ll mask , i , j , k;
void solve(){
    ll n , SUM = 0 , con = 0; cin >> n;
    for(i = 1 ; i <= n ; i++) cin >> a[i];
    pref[0][0] = true;
    for(i = 1 ; i <= n ; i++){
        SUM += a[i];
        for(j = 0 ; j <= SUM ; j++) pref[i][j] = pref[i - 1][j];
        for(j = 0 ; j + a[i] <= SUM ; j++) pref[i][j + a[i]] |= pref[i - 1][j];
    }
    SUM = 0;
    suff[n + 1][0] = true;
    for(i = n ; i >= 1 ; i--){
        SUM += a[i];
        for(j = 0 ; j <= SUM ; j++) suff[i][j] = suff[i + 1][j];
        for(j = 0 ; j + a[i] <= SUM ; j++) suff[i][j + a[i]] |= suff[i + 1][j];
    }
    vector<ll> ans;
    for(k = 1 ; k <= SUM ; k++){
        bool ok = true;
        for(i = 1 ; i <= n ; i++){
            ll cur = SUM + k - a[i];
            if(cur & 1){
                ok = false;
                break;
            }
            bool check = false;
            for(j = 0 ; j <= cur / 2 ; j++){
                if(pref[i - 1][j] && suff[i + 1][cur / 2 - j]){
                    check = true;
                    break;
                }
            }
            if(!check){
                ok = false;
                break;
            }
        }
        if(!ok || (SUM & 1)) continue;
        bool check = false;
        for(j = 0 ; j <= SUM / 2 ; j++){
            if(pref[n][j] && suff[n + 1][SUM / 2 - j]){
                check = true;
                break;
            }
        }
        if(check) ans.pb(k);
    }
    cout << ans.size() << endl;
    for(ll i : ans) cout << i << ' ';
    cout << endl;
}     

 
signed main(){
    Zemur007;
    //open;
    ll t = 1;
    // cin >> t;
    while(t--){
        solve();
    }
    // for(ll testcase = 1 ; testcase <= t ; testcase++){
    //     cout << "Case " << testcase << ":" << endl;
    //     solve();
    // }
}

• Subtask 1: 6 / 6
• Subtask 2: 7 / 7
• Subtask 3: 0 / 15
• Subtask 4: 0 / 16
• Subtask 5: 0 / 21
• Subtask 6: 0 / 35