Submission #1020165

#	Time	Username	Problem	Language	Result	Execution time	Memory
1020165		DucNguyen2007	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	97 ms	13272 KiB

foehn_phenomena

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long double
#define pll pair<ll,ll>
#define fi first
#define se second
const ll inf=2e18;
const int maxN=3e5+5;
int n,q;
ll a[maxN+1],b[maxN+1],s,t,ans=0;
void add(int i)
{
    if(b[i]>0)
    {
        ans+=(b[i]*s);
    }
    else ans+=(b[i]*t);
}
void del(int i)
{
    if(b[i]>0)
    {
        ans-=(b[i]*s);
    }
    else ans-=(b[i]*t);
}
int main()
{
    //freopen("","r",stdin);
    //freopen("","w",stdout);
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin>>n>>q>>s>>t;
    for(int i=0;i<=n;i++)
    {
        cin>>a[i];
    }
    for(int i=1;i<=n;i++)
    {
        b[i]=a[i]-a[i-1];
        if(b[i]>0)
        {
            ans-=(b[i]*s);
        }
        else ans-=(b[i]*t);
    }
    while(q--)
    {
        int l,r;
        ll x;
        cin>>l>>r>>x;
        add(l);
        if(r+1<=n)
        {
            add(r+1);
        }
        b[l]+=x;
        if(r+1<=n)
        {
            b[r+1]-=x;
        }
        del(l);
        if(r+1<=n)
        {
            del(r+1);
        }
        cout<<ans<<'\n';
    }
}

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