Submission #425752

#	Time	Username	Problem	Language	Result	Execution time	Memory
425752		egekabas	Bigger segments (IZhO19_segments)	C++14	0 / 100	1 ms	204 KiB

segments

#include <bits/stdc++.h>
#define all(x) (x).begin(), (x).end()
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll, ll> pll;
typedef pair<ull, ull> pull;
typedef pair<int, int> pii;
typedef pair<ld, ld> pld;
ll n;
ll a[500009], pre[500009];
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    
    //freopen("in.txt", "r", stdin);
    //freopen("out.txt", "w", stdout);

    cin >> n;
    for(ll i = 0; i < n; ++i){
        cin >> a[i];
        pre[i] = a[i];
        if(i)
            pre[i] += pre[i-1];
    }
    pii last = {-1e9, 0};
    ll befsum = 0, cursum = a[0];
    ll ans = 1;
    for(ll i = 0; i < n; ++i){
        if(last.ff >= 0){
            while(befsum+2*a[last.ff+1] <= cursum){
                ++last.ff;
                befsum += a[last.ff];
                cursum -= a[last.ff];
            }
        }
        if(pre[i]-pre[last.ss] >= cursum){
            befsum = cursum;
            cursum = pre[i]-pre[last.ss];
            last.ff = last.ss;
            last.ss = i;
            ++ans;
            continue;
        }
        if(last.ff >= 0 && last.ss == i-1 && a[last.ff+1] >= 2*a[i] && cursum+a[i] >= befsum+a[last.ff+1]){
            last.ss++;
            cursum += a[i];
            last.ff++;
            cursum -= a[last.ff];
            befsum += a[last.ff];
        }
    }
    cout << ans << '\n';
}

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