Submission #1150779

#	Time	Username	Problem	Language	Result	Execution time	Memory
1150779		somefolk	Kpart (eJOI21_kpart)	C++20	10 / 100	2095 ms	492 KiB

Main

#include <iostream>
#include <cmath>
#include <algorithm>
#include <string>
#include <vector>
#include <map>
#include <unordered_map>
#include <queue>
#include <set>
#include <unordered_set>
#include <complex>
#include <list>
#include <cassert>
#include <chrono>
#include <random>
#include <stack>
#include <iomanip>
#include <fstream>
using namespace std;

#define endl "\n"
// #define int long long

const int INF = 2 * 1e5 + 5;
const int MOD = 1e9 + 7;

bool check(int sum, int n, vector<int> &a){
    vector<bool> dp(sum+1, false), curr(sum+1);
    dp[0] = true;

    for(int i = 1; i <= n; i++){
        for(int j = 0; j <= sum; j++){
            if(j < a[i-1]){
                curr[j] = dp[j];
            } else{
                if(dp[j] == true) curr[j] = true;
                if(dp[j-a[i-1]] == true) curr[j] = true;
            }
            if(dp[sum] == 1){
                return true;
            }
        }
        dp = curr;
    }
    return false;
}

void solve(){
    int n;
    cin >> n;
    vector<int> a(n), pref(n);
    for(int i = 0; i < n; i++){
        cin >> a[i];
        if(!i) pref[i] = a[i];
        else pref[i] = pref[i-1] + a[i];
    }

    set<int> sol;
    for(int k = 2; k <= n; k++){
        bool good = true;
        vector<int> b(a.begin(), a.begin()+k);
        for(int i = k; i <= n; i++){
            b.push_back(a[i]);
            int sum = pref[i-1] - pref[i-k-1];
            if(sum%2!=0){
                good = false;
                break;
            }
            if(!check(sum/2, k, b)){
                good = false;
                break;
            }
            b.erase(b.begin());
        }
        if(good){
            sol.insert(k);
        }
    }

    cout << sol.size() << " ";
    for(auto &i : sol){
        cout << i << " ";
    }
    cout << endl;
}

int32_t main(){
    ios_base::sync_with_stdio(false); cin.tie(nullptr);
    int t = 1;
    cin >> t;
    while(t--) solve();
    return 0;
}

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