Submission #51475

#	Time	Username	Problem	Language	Result	Execution time	Memory
51475		kotorin	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	888 ms	7444 KiB

foehn_phenomena

#include <iostream>

long long A[200001];
long long chk[200001];

long long sum = 0;
long long n, q, s, t;

inline long long calc(long long x)
{
    return (x < 0 ? x * s : x * t);
}

int main()
{
    std::cin >> n >> q >> s >> t;
    for (long long i = 0; i <= n; ++i)
    {
        std::cin >> A[i];
    }
    for (long long i = 1; i <= n; ++i)
    {
        chk[i] = A[i - 1] - A[i];
        sum += calc(chk[i]);
    }

    while (q-- > 0)
    {
        long long l, r, x;
        std::cin >> l >> r >> x;
        if (l > 0)
        {
            sum -= calc(chk[l]);
            chk[l] -= x;
            sum += calc(chk[l]);
        }
        if (r < n)
        {
            sum -= calc(chk[r + 1]);
            chk[r + 1] += x;
            sum += calc(chk[r + 1]);
        }
        std::cout << sum << '\n';
    }

    return 0;
}

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