Submission #497431

#	Time	Username	Problem	Language	Result	Execution time	Memory
497431		Ierus	Bigger segments (IZhO19_segments)	C++17	27 / 100	1568 ms	71060 KiB

segments

#include<bits/stdc++.h>
using namespace std;
#pragma GCC optimize ("unroll-loops,Ofast,O3")
#pragma GCC target("avx,avx2,fma")
#define F first
#define S second
#define int long long
#define sz(x) (int)x.size()
#define pb push_back
#define eb emplace_back
#define all(x) (x).begin(),(x).end()
//const int E = 5e5+777;
//const long long inf = 1e18+777;
//const int N = 3e3+777;
//const int MOD = 1e9+7;
int getfast(vector<int> v){
	int n = sz(v);
	int pref[n+2]{}, a[n+2]{};
	vector<vector<int>> dp(n+3, vector<int>(n+3, 0LL));
	for(int i = 0; i < n; ++i) a[i+1] = v[i];
	for(int i = 1; i <= n; ++i) pref[i] = pref[i-1] + a[i];
    auto get = [&](int l, int r){
    	if(l == -1 || r == -1) return -(int)1e9;
    	return pref[r] - pref[l-1];
	};
	for(int i = 1; i <= n; ++i) dp[1][i] = 1;
    for(int l = 2; l <= n; ++l){
        for(int r = l; r <= n; ++r){
            int mx = -1;
            for(int k = 1; k < l; ++k){
                if(get(k, l-1) <= get(l, r)){
                    mx = max(mx, dp[k][l-1]);
                }
            }
            if(mx == -1){
                dp[l][r] = mx;
            }else{
                dp[l][r] = mx + 1;
            }
        }
    }
//    for(int i = 1; i <= n; ++i){
//        for(int j = i; j <= n; ++j){
//            cerr << "{" << i << "," << j << "}: " << dp[i][j] << '\n';
//        }
//    }
    int res = 0;
    for(int i = 1; i <= n; ++i){
        res = max(res, dp[i][n]);
    }
    return res;

}
signed main(){
    ios_base::sync_with_stdio(0),
    cin.tie(0),cout.tie(0);
	int n; cin >> n;
	vector<int> a(n);
	for(auto &i : a) cin >> i;
	cout << getfast(a);
}

• Subtask 1: 13 / 13
• Subtask 2: 14 / 14
• Subtask 3: 0 / 10
• Subtask 4: 0 / 36
• Subtask 5: 0 / 27