Submission #939110

#	Time	Username	Problem	Language	Result	Execution time	Memory
939110		qwe1rt1yuiop1	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	98 ms	13268 KiB

foehn_phenomena

#include <bits/stdc++.h>
#define int long long
using namespace std;

void solve()
{
    int n, q, a, b;
    cin >> n >> q >> a >> b;
    vector<int> v(n + 1);
    for (int &i : v)
        cin >> i;

    int ans = 0;

    vector<int> dif(n);
    for (int i = 0; i < n; ++i)
    {
        dif[i] = v[i + 1] - v[i];
        if (dif[i] >= 0)
            ans -= a * dif[i];
        else
            ans -= b * dif[i];
    }

    while (q--)
    {
        int l, r, k;
        cin >> l >> r >> k;
        --l;
        if (dif[l] >= 0)
            ans += a * dif[l];
        else
            ans += b * dif[l];
        dif[l] += k;
        if (dif[l] >= 0)
            ans -= a * dif[l];
        else
            ans -= b * dif[l];

        if (r < n)
        {
            if (dif[r] >= 0)
                ans += a * dif[r];
            else
                ans += b * dif[r];
            dif[r] -= k;
            if (dif[r] >= 0)
                ans -= a * dif[r];
            else
                ans -= b * dif[r];
        }
        cout << ans << '\n';
    }
}

/*
3 5 1 2
0 4 1 8
1 2 2
1 1 -2
2 3 5
1 2 -1
1 3 5

*/

signed main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);

    solve();

    return 0;
}

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