Submission #523963

#	Time	Username	Problem	Language	Result	Execution time	Memory
523963		Monarchuwu	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	111 ms	13148 KiB

foehn_phenomena

#include<iostream>
#include<algorithm>
using namespace std;
typedef long long ll;

const int N = 2e5 + 8;
int n, q, s, t;
ll a[N], d[N];

ll get(ll x) {
    if (x > 0)
        return -x * s;
    return -x * t;
}

int main() {
    cin.tie(NULL)->sync_with_stdio(false);
    cin >> n >> q >> s >> t;
    for (int i = 0; i <= n; ++i) cin >> a[i];
    for (int i = 1; i <= n; ++i) d[i] = a[i] - a[i - 1];

    ll sum(0);
    for (int i = 1; i <= n; ++i)
        sum += get(d[i]);

    int l, r, x; while (q--) {
        cin >> l >> r >> x; // l and r+1

        sum -= get(d[l]);
        d[l] += x;
        sum += get(d[l]);

        if (r != n) {
            sum -= get(d[r + 1]);
            d[r + 1] -= x;
            sum += get(d[r + 1]);
        }

        cout << sum << '\n';
    }
}
/**  /\_/\
 *  (= ._.)
 *  / >0  \>1
**/

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