Submission #1013828

#	Time	Username	Problem	Language	Result	Execution time	Memory
1013828		snpmrnhlol	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	86 ms	13136 KiB

foehn_phenomena

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const ll N = 2e5;
ll v[N + 1];
ll dif[N + 1];
ll n,q,s,t;
ll ans = 0;
void modify(ll i, ll x){
    if(i > n || i <= 0)return;
    if(dif[i] > 0){
        ans+=1ll*s*abs(dif[i]);
    }else{
        ans-=1ll*t*abs(dif[i]);
    }
    dif[i] = x;
    if(dif[i] > 0){
        ans-=1ll*s*abs(dif[i]);
    }else{
        ans+=1ll*t*abs(dif[i]);
    }
}
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin>>n>>q>>s>>t;
    for(ll i = 0;i <= n;i++){
        cin>>v[i];
        if(i){
            dif[i] = v[i] - v[i - 1];
            if(dif[i] > 0){
                ans-=s*abs(dif[i]);
            }else{
                ans+=t*abs(dif[i]);
            }
        }
    }
    for(ll i = 0;i < q;i++){
        ll l,r,x;
        cin>>l>>r>>x;
        modify(l,dif[l] + x);
        modify(r + 1,dif[r + 1] - x);
        cout<<ans<<'\n';
    }
    return 0;
}

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