Submission #958921

#	Time	Username	Problem	Language	Result	Execution time	Memory
958921		ono_de206	Cigle (COI21_cigle)	C++14	0 / 100	2 ms	3420 KiB

cigle

#include<bits/stdc++.h>
using namespace std;

#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define in insert
#define all(x) x.begin(),x.end()
#define pb push_back
#define eb emplace_back
#define ff first
#define ss second

#define int long long

typedef long long ll;
typedef vector<int> vi;
typedef set<int> si;
typedef multiset<int> msi;
typedef pair<int, int> pii;
typedef vector<pii> vpii;
// typedef pair<int, int> P;

template<typename T, typename U>
ostream & operator << (ostream &out, const pair<T, U> &c) {
	out << c.first << ' ' << c.second;
	return out;
}

template<typename T>
ostream & operator << (ostream &out, vector<T> &v) {
	const int sz = v.size();
	for (int i = 0; i < sz; i++) {
		if (i) out << ' ';
		out << v[i];
	}
	return out;
}

template<typename T>
istream & operator >> (istream &in, vector<T> &v) {
	for (T &x : v) in >> x;
	return in;
}

template<typename T, typename U>
	istream & operator >> (istream &in, pair<T, U> &c) {
	in >> c.first;
	in >> c.second;
	return in;
}

template<typename T>
void mxx(T &a, T b){if(b > a) a = b;}
template<typename T>
void mnn(T &a, T b){if(b < a) a = b;}

const int mxn = 5e3 + 10, MXLOG = 22, mod = 1e9 + 7, P = 1181, D = 1523, N = 2500;
const long long inf = 2e18 + 10;
int dp[mxn][mxn], a[mxn];

void go() {
	int n;
	cin >> n;
	for(int i = 1; i <= n; i++) {
		cin >> a[i];
	}
	for(int i = 1; i <= n; i++) {
		for(int j = 1; j <= i; j++) {
			mxx(dp[i][j], dp[i][j - 1]);
			mxx(dp[i][j], dp[j - 1][j - 1]);
		}
		int sum1 = 0, sum2 = 0, l = i, cnt = 0;
		for(int j = i + 1; j < n; j++) {
			sum1 += a[j];
			while(sum2 < sum1 && l > 1) {
				sum2 += a[l--];
			}
			if(sum1 == sum2) {
				cnt++;
				mxx(dp[j + 1][i + 1], dp[i][l] + cnt);
			} else {
				mxx(dp[j][i + 1], dp[i][l + 1] + cnt);
			}
		}
	}
	int ans = 0;
	for(int i = n; i >= 1; i--) {
		mxx(ans, dp[n][i]);
	}
	cout << ans << endl;
}

signed main() {
	fast;
	int t = 1;
	// cin >> t;
	while(t--) {
		go();
	}
	return 0;
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 11
• Subtask 3: 0 / 13
• Subtask 4: 0 / 15
• Subtask 5: 0 / 52