Submission #519793

#	Time	Username	Problem	Language	Result	Execution time	Memory
519793		Carmel_Ab1	Kpart (eJOI21_kpart)	C++17	0 / 100	2096 ms	588 KiB

Main

/*
#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
 */
#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;

typedef long double ld;
typedef long long ll;
typedef unsigned long long ull;
typedef vector<int>vi;
typedef vector<vector<int>>vvi;
typedef vector<ll>vl;
typedef vector<vl> vvl;
typedef pair<int,int>pi;
typedef pair<ll,ll> pl;
typedef vector<pl> vpl;
typedef vector<ld> vld;
typedef pair<ld,ld> pld;
typedef vector<pi> vpi;

//typedef tree<ll, null_type, less_equal<ll>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;
template<typename T> ostream& operator<<(ostream& os, vector<T>& a){os<<"[";for(int i=0; i<ll(a.size()); i++){os << a[i] << ((i!=ll(a.size()-1)?" ":""));}os << "]\n"; return os;}

#define all(x) x.begin(),x.end()
#define YES out("YES")
#define NO out("NO")
#define out(x){cout << x << "\n"; return;}
#define outfl(x){cout << x << endl;return;}
#define GLHF ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)
#define print(x){for(auto ait:x) cout << ait << " "; cout << "\n";}
#define pb push_back
#define umap unordered_map

template<typename T1, typename T2> istream& operator>>(istream& is, pair<T1, T2>& p){is >> p.first >> p.second;return is;}
template<typename T1, typename T2> ostream& operator<<(ostream& os, pair<T1, T2>& p){os <<"" << p.first << " " << p.second << ""; return os;}
void usaco(string taskname){
    string fin = taskname + ".in";
    string fout = taskname + ".out";
    const char* FIN = fin.c_str();
    const char* FOUT = fout.c_str();
    freopen(FIN, "r", stdin);
    freopen(FOUT, "w", stdout);
}
template<typename T>
void read(vector<T>& v){
    int n=v.size();
    for(int i=0; i<n; i++)
        cin >> v[i];
}
template<typename T>
vector<T>UNQ(vector<T>a){
    vector<T>ans;
    for(T t:a)
        if(ans.empty() || t!=ans.back())
            ans.push_back(t);
    return ans;
}



void solve();
int main(){
    GLHF;
    int t=1;
    cin >> t;
    while(t--)
        solve();
}
vl dp;
ll mod=1e9+7;
void init(){
    int sz=5e4+1;
    dp.resize(sz);
    dp[0]=1;
}
void add(int x){
    for(int i=dp.size()-1; i>=x; i--)
        dp[i]=(dp[i-x]+dp[i])%mod;
}
void del(int x){
    for(int i=dp.size()-1; i>=x; i--)
        dp[i]=((dp[i-x]-dp[i] + mod)%mod);
}

void solve() {
    int n;
    cin >> n;
    vi a(n);
    read(a);

    vi ans;
    for(int k=2; k<=n; k++){
        init();
        int sum=0;
        for(int i=0; i<k; i++)
            add(a[i]),sum+=a[i];
        bool ok=1;
        for(int i=k;ok && i<=n; i++){
            if(sum%2 || !dp[sum/2])
                ok=0;
            if(i==n)break;
            add(a[i]);
            del(a[i-k]);
        }
        if(ok)
            ans.pb(k);
    }
    cout << ans.size() << " ";
    print(ans)
}
/*
 2
7
7 3 5 1 3 3 5
6
1 2 3 5 8 3
 */

Compilation message (stderr)

Main.cpp: In function 'void usaco(std::string)':
Main.cpp:47:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |     freopen(FIN, "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~
Main.cpp:48:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |     freopen(FOUT, "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~

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