Submission #425757

#	Time	Username	Problem	Language	Result	Execution time	Memory
425757		egekabas	Bigger segments (IZhO19_segments)	C++14	100 / 100	102 ms	20844 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];
pll val[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];
        val[i] = {0LL, 1e9};
    }
    val[0] = {1, -a[0]};
    ll ans = 0;
    for(ll i = 0; i < n; ++i){
        ll curv = val[i].ff;
        ll curs = -val[i].ss;
        ans = max(ans, curv);
        ll idx = lower_bound(pre, pre+n, pre[i]+curs)-pre;
        val[idx] = max(val[idx], {curv+1, -(pre[idx]-pre[i])});
        val[i+1] = max(val[i+1], {curv, -curs-a[i+1]});
    }
    cout << ans << '\n';
}

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