Submission #1150442

#	Time	Username	Problem	Language	Result	Execution time	Memory
1150442		tvgk	Foehn Phenomena (JOI17_foehn_phenomena)	C++20	100 / 100	68 ms	7240 KiB

foehn_phenomena

#include<bits/stdc++.h>
using namespace std;
#define task "a"
#define se second
#define fi first
#define ll long long
#define ii pair<ll, ll>
const long mxN = 2e5 + 7;

ll dwn, up, a[mxN], dif[mxN];
int n, q;

ll Change(ll j)
{
    if (j > 0)
        return j * dwn;
    return j * up;
}

ll Upd(int j, ll val)
{
    if (j > n)
        return 0;

    ll res = Change(dif[j]);
    dif[j] += val;
    return res - Change(dif[j]);
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    //freopen(task".INP", "r", stdin);
    //freopen(task".OUT", "w", stdout);

    cin >> n >> q >> dwn >> up;
    ll ans = 0;
    for (int i = 0; i <= n; i++)
    {
        cin >> a[i];

        if (!i)
            continue;

        dif[i] = a[i] - a[i - 1];
        ans -= Change(dif[i]);
    }

    for (int i = 1; i <= q; i++)
    {
        int l, r;
        ll val;
        cin >> l >> r >> val;

        ans += Upd(l, val) + Upd(r + 1, -val);
        cout << ans << '\n';
    }
}

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