Submission #751148

#	Time	Username	Problem	Language	Result	Execution time	Memory
751148		vjudge1	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	117 ms	5756 KiB

foehn_phenomena

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

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    ll n, q, s, t;
    cin >> n >> q >> s >> t;
    vector<ll> diff(n); // diff i sama i+1;
    ll prev, now;
    ll diffAll = 0;
    cin >> prev;
    for (int i = 0; i < n; i++)
    {
        cin >> now;
        diff[i] = prev - now;
        if (diff[i] <= 0)
        {
            diffAll += (diff[i] * s);
        }
        else
        {
            diffAll += (diff[i] * t);
        }
        prev = now;
    }
    // for (auto x : diff)
    // {
    //     cout << x;
    // }
    for (int i = 0; i < q; i++)
    {
        ll l, r, x;
        cin >> l >> r >> x;

        if (l > 0)
        {
            if (diff[l - 1] <= 0)
            {
                diffAll -= diff[l - 1] * s;
            }
            else
            {
                diffAll -= diff[l - 1] * t;
            }
            diff[l - 1] -= x;
            if (diff[l - 1] <= 0)
            {
                diffAll += diff[l - 1] * s;
            }
            else
            {
                diffAll += diff[l - 1] * t;
            }
        }
        if (r < n)
        {
            if (diff[r] <= 0)
            {
                diffAll -= diff[r] * s;
            }
            else
            {
                diffAll -= diff[r] * t;
            }
            diff[r] += x;
            if (diff[r] <= 0)
            {
                diffAll += diff[r] * s;
            }
            else
            {
                diffAll += diff[r] * t;
            }
        }
        cout << diffAll << "\n";
    }
    return 0;
}

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