Submission #570046

#	Time	Username	Problem	Language	Result	Execution time	Memory
570046		jcelin	Cigle (COI21_cigle)	C++14	100 / 100	248 ms	67396 KiB

cigle

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


typedef long long ll;
typedef long double ld;
typedef unsigned int ui;

#define ii pair<int,int>
#define pll pair<ll,ll>
#define vi vector<int>
#define vii vector<ii>
#define vll vector<ll>
#define vpll vector<pll>
#define matrix vector<vi>
#define matrixLL vector<vLL>
#define vs vector<string>
#define vui vector<ui>
#define msi multiset<int>
#define mss multiset<string>
#define si set<int>
#define ss set<string>
#define PB push_back
#define PF push_front
#define PPB pop_back
#define PPF pop_front
#define X first
#define Y second
#define MP make_pair
#define FOR(i, a, b) for (int i = int(a); i < int(b); i++)
#define REP(i, n) FOR(i, 0, n)
#define all(x) (x).begin(), (x).end()

const int dx[] = {-1, 1, 0, 0};
const int dy[] = {0, 0, -1, 1};
const int dxx[] = {-1, 1, 0, 0, 1, 1, -1, -1};
const int dyy[] = {0, 0, -1, 1, -1, 1, -1, 1};
const string abc="abcdefghijklmnopqrstuvwxyz";
const string ABC="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const ld pi = 3.14159265;
const int mod = 1e9 + 7;
const int MOD = 1e9 + 7;
const int N = 5e3 + 7;
const int inf = mod;
const ll INF = 1e18;
const ll zero = ll(0);
const int logo = 20;
const int off = 1 << logo;
const int trsz = off << 1;

int aa[N + 1], dp[N + 1][N + 1], dq[N + 1];

void solve(){
	int n, ans;
	cin >> n;
	for(int i=1; i<=n; i++) cin >> aa[i], aa[i] += aa[i - 1];
	
	for(int i=1; i<=n; i++) dp[0][i] = 0;
	
	for(int j=1; j<=n; j++){
		for(int i=0; i<j; i++) dq[i] = dp[i][j];
		for(int i=1; i<j; i++) dq[i] = max(dq[i], dq[i-1]);
		
		int x=0, c = 0;
		for(int i=j-1, k=j+1; k<=n; k++){
			dp[j][k] = x;
			while(i >= 0 and aa[i] + aa[k] > aa[j] * 2) i--;
			if(i > 0 and aa[i] + aa[k] == aa[j] * 2) x = max(x, dq[i - 1] + (++c));
		}
	}
	ans = 0;
	for(int i=0; i<n; i++) ans = max(ans, dp[i][n]);
	cout << ans << "\n";
}


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

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