Submission #129298

#	Time	Username	Problem	Language	Result	Execution time	Memory
129298		souhhcong	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	691 ms	7396 KiB

foehn_phenomena

#include <iostream>
using namespace std;

#define int long long
const int N = 2e5+5;
int n, q, s, t;
int l, r, val, sum_neg, sum_pos;
int a[N], diff[N];

void update(int i, int val)
{
    if (i < 0 || i >= n) return;
    if (diff[i] > 0 && diff[i] + val >= 0)
    {
        sum_pos += val;
    }
    else if (diff[i] > 0 && diff[i] + val < 0)
    {
        sum_pos -= diff[i];
        sum_neg += (diff[i]+val);
    }
    else if (diff[i] <= 0 && diff[i]+val >= 0)
    {
        sum_neg -= diff[i];
        sum_pos += diff[i]+val;
    }
    else if (diff[i] <= 0 && diff[i] + val < 0)
    {
        sum_neg += val;
    }
    diff[i] += val;
}
signed 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];
    }
    for (int i = 0; i < n; i++)
    {
        diff[i] = a[i] - a[i+1];
        if (diff[i] < 0)
            sum_neg += diff[i];
        else
            sum_pos += diff[i];
    }
    while(q--)
    {
        cin >> l >> r >> val;
        update(l-1,-val);
        update(r,val);
        cout << sum_neg*s + sum_pos*t << endl;
    }
}

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