Submission #343368

#	Time	Username	Problem	Language	Result	Execution time	Memory
343368		spike1236	Bootfall (IZhO17_bootfall)	C++14	100 / 100	338 ms	4460 KiB

bootfall

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
#define f first
#define s second
#define ll long long
#define ld long double
#define all(_v) _v.begin(), _v.end()
#define sz(_v) (int)_v.size()
#define pii pair <int, int>
#define pll pair <ll, ll>
#define veci vector <int>
#define vecll vector <ll>


const int dx[4] = {1, -1, 0, 0};
const int dy[4] = {0, 0, -1, 1};
const double PI = 3.1415926535897932384626433832795;
const double eps = 1e-9;
const int MOD1 = 1e9 + 7;
const int MOD2 = 998244353;

const int MX = 250010;
int n;
int a[510];
int used[MX];
ll dp[MX];
int sum;

void add(int x) {
    for(int i = sum; i >= 0; --i)
        dp[i + x] += dp[i];
    sum += x;
}

void del(int x) {
    sum -= x;
    for(int i = 0; i <= sum; ++i)
        dp[i + x] -= dp[i];
}

void solve() {
    cin >> n;
    dp[0] = 1;
    for(int i = 1; i <= n; ++i) cin >> a[i], add(a[i]);
    if(sum & 1 || !dp[sum / 2]) {
        cout << 0;
        return;
    }
    veci ans;
    for(int i = 1; i <= n; ++i) {
        del(a[i]);
        for(int j = 1; j < MX; ++j)
            if((sum + j) & 1 || !dp[(sum + j) / 2])
                used[j] = 1;
        add(a[i]);
    }
    for(int i = 1; i < MX; ++i)
        if(!used[i])
            ans.pb(i);
    cout << sz(ans) << '\n';
    for(auto it : ans) cout << it << ' ';
}


int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int T = 1;
    ///cin >> T;
    while(T--) solve(), cout << '\n';
    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