Submission #765890

#	Time	Username	Problem	Language	Result	Execution time	Memory
765890		vjudge1	Kpart (eJOI21_kpart)	C++17	10 / 100	2080 ms	492 KiB

Main

// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>

#define ordered_set tree<ll,null_type,less<ll>,rb_tree_tag,tree_order_statistics_node_update>
#define len(x) (int)x.size()
#define ull unsigned long long
#define F first
#define S second
#define pb push_back
#define pf push_front
#define popb pop_back
#define popf pop_front
#define int long long

using namespace std;
using namespace __gnu_pbds;
using ll = long long;

const int N = 2e5 + 5;
const int MOD = 1e9 + 7;
int t,n,a[N],dp[N],p[N];
vector <int> ans;

main(){
	// freopen("txt.in", "r", stdin);
	// freopen("txt.out", "w", stdout);
	ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	dp[0] = 1;
	cin >> t;
	while(t--){
		cin >> n;
		for (int i=1;i<=n;i++){
			cin >> a[i];
			p[i] = p[i - 1] + a[i];
		}
		for (int i=2;i<=n;i++){
			bool ok = 1;
			for (int j=i;j<=n;j++){
				if ((p[j] - p[j-i]) % 2 == 1){
					ok = 0;
					break;
				}
				for (int k=1;k<=(p[j]-p[j-i])/2;k++){
					dp[k] = 0;
				}
				for (int k=j-i+1;k<=j;k++){
					for (int w=(p[j]-p[j-i])/2;w>=0;w--){
						if (dp[w]) dp[w + a[k]] = 1;
					}
				}
				if (!dp[(p[j]-p[j-i])/2]){
					ok = 0;
					break;	
				}
			}
			if (ok){
				ans.pb(i);
			}
		}
		cout << len(ans) << ' ';
		for (auto it : ans){
			cout << it << ' ';
		} cout << '\n';\
		ans.clear();
	}
}

//order_of_key(k): Number of items strictly smaller than k .
//find_by_order(k): K-th element in a set (counting from zero).

//sum of squares n*(n+1)*(2n+1)/6
//sum of cubes [n*(n+1)/2]^2
//sum of squares for odds n*(4*n*n-1)/3
//sum of cubes for odds n*n*(2*n*n-1)

//a/b%mod = a*(b^(m-2)%mod)
//(a>>x)&1 == 0
//a^b = (a+b)-2(a&b)

//srand(time(0))-always changing

Compilation message (stderr)

Main.cpp:27:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   27 | main(){
      | ^~~~

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