Submission #1128106

#	Time	Username	Problem	Language	Result	Execution time	Memory
1128106		farni4k	Bootfall (IZhO17_bootfall)	C++20	13 / 100	1095 ms	824 KiB

bootfall

#include <bits/stdc++.h>
#define int long long
using namespace std;
const int N=125002;
int a[505];
bool dp[505][N];
bool can(int n=500, int sum=0) {
    int nd=sum/2;
    for (int i = 1; i<=n; i++) {
        for (int j = 0; j<=nd; j++) dp[i][j]=0;
    }
    dp[0][0]=1;
    if (sum%2==0) {
        for (int i = 1; i<=n; i++) {
            for (int j = 0; j<=nd; j++) {
                if (a[i-1]<=j) dp[i][j]=(dp[i-1][j] || dp[i-1][j-a[i-1]]);
                else dp[i][j]=dp[i-1][j];
            }
        }
        if (dp[n][nd]) {
            return true;
        }
    }
    return false;
}

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n; cin>>n;
    int sum=0;
    for (int i = 0; i<n; i++) {
        cin>>a[i];
        sum+=a[i];
    }
    int hf=sum;
    if (can(n, sum)) {
        vector<int> ans;
        for (int i = 1; i<=hf; i++) {
            bool h=1;
            for (int j = 0; j<n; j++) {
                int dos=a[j];
                sum-=a[j];
                sum+=i;
                a[j]=i;
                if (!can(n,sum)) {
                    h=0;
                    sum=hf;
                    a[j]=dos;
                    break;
                }
                sum=hf;
                a[j]=dos;
            }
            if (h) ans.push_back(i);
        }
        cout<<ans.size()<<'\n';
        for (int i = 0; i<ans.size(); i++) cout<<ans[i]<<' ';
    } else {
        cout<<"0";
    }
}

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