Submission #1163932

#	Time	Username	Problem	Language	Result	Execution time	Memory
1163932		canhnam357	Foehn Phenomena (JOI17_foehn_phenomena)	C++20	100 / 100	61 ms	5772 KiB

foehn_phenomena

// source problem : 
#include <bits/stdc++.h>
using namespace std;
#define all(x) x.begin(), x.end()
#define int long long
#define lb lower_bound
#define ub upper_bound
#define MASK(i) (1LL << (i))
const int inf = 1e18;
void ckmax(int& f, int s)
{
    f = (f > s ? f : s);
}
void ckmin(int& f, int s)
{
    f = (f < s ? f : s);
}
int32_t main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n, q, s, t;
    cin >> n >> q >> s >> t;
    vector<int> a(n + 1);
    for (int i = 0; i <= n; i++) cin >> a[i];
    int cur = 0;
    for (int i = n; i > 0; i--)
    {
        a[i] -= a[i - 1];
        if (a[i] > 0) cur -= s * a[i];
        else cur -= t * a[i];
    }   
    while (q--)
    {
        int l, r, x;
        cin >> l >> r >> x;
        if (a[l] > 0) cur += s * a[l];
        else cur += t * a[l];
        a[l] += x;
        if (a[l] > 0) cur -= s * a[l];
        else cur -= t * a[l];
        if (r < n)
        {
            if (a[r + 1] > 0) cur += s * a[r + 1];
            else cur += t * a[r + 1];
            a[r + 1] -= x;
            if (a[r + 1] > 0) cur -= s * a[r + 1];
            else cur -= t * a[r + 1];
        }
        cout << cur << '\n';
    }
    return 0;
}

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