Submission #538313

#	Time	Username	Problem	Language	Result	Execution time	Memory
538313		status_coding	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	113 ms	11580 KiB

foehn_phenomena

#include <iostream>

using namespace std;

long long n,q,s,t;
long long ans;

long long a[200005];

void add(int i)
{
    if(i > n)
        return;

    if(a[i] > 0)
        ans -= a[i]*s;
    else
        ans -= a[i]*t;
}
void del(int i)
{
    if(i > n)
        return;

    if(a[i] > 0)
        ans += a[i]*s;
    else
        ans += a[i]*t;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    cin>>n>>q>>s>>t;

    cin>>a[0];
    for(int i=1;i<=n;i++)
        cin>>a[i];

    for(int i=n;i>=1;i--)
    {
        a[i]-=a[i-1];
        add(i);
    }

    //cout<<ans<<'\n';

    while(q)
    {
        q--;

        int l, r, x;
        cin>>l>>r>>x;

        del(l);
        del(r+1);

        a[l]+=x;
        a[r+1]-=x;

        add(l);
        add(r+1);

        cout<<ans<<'\n';
    }
    return 0;
}

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