Submission #1259482

#	Time	Username	Problem	Language	Result	Execution time	Memory
1259482		ngonamkhanh	Foehn Phenomena (JOI17_foehn_phenomena)	C++20	100 / 100	62 ms	7256 KiB

foehn_phenomena

#include <bits/stdc++.h>
using namespace std;
#define ll long long
ll n, q, s, t;
ll l, r, x;
ll a[200005];
ll d[200005];
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n >> q >> s >> t;
    for (int i = 0; i <= n; i++)
    {
        cin >> a[i];
    }
    ll kq = 0;
    for (int i = 1; i <= n; i++)
    {
        d[i] = a[i] - a[i - 1];
        if (d[i] <= 0)
        {
            kq += -t * d[i];
        }
        else
        {
            kq -= s * d[i];
        }
    }
    for (int i = 1; i <= q; i++)
    {
        cin >> l >> r >> x;

        if (d[l] <= 0)
        {
            kq -= -t * d[l];
        }
        else
        {
            kq += s * d[l];
        }
        d[l] += x;
        if (d[l] <= 0)
        {
            kq += -t * d[l];
        }
        else
        {
            kq -= s * d[l];
        }

        if (r + 1 <= n)
        {
            if (d[r + 1] <= 0)
            {
                kq -= -t * d[r + 1];
            }
            else
            {
                kq += s * d[r + 1];
            }
            d[r + 1] -= x;
            if (d[r + 1] <= 0)
            {
                kq += -t * d[r + 1];
            }
            else
            {
                kq -= s * d[r + 1];
            }
        }
        cout << kq << '\n';
    }
}

• Subtask 1: 30 / 30
• Subtask 2: 10 / 10
• Subtask 3: 60 / 60