Submission #320766

#	Time	Username	Problem	Language	Result	Execution time	Memory
320766		urosk	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	10 / 100	599 ms	10748 KiB

foehn_phenomena

#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define inf 1e15
#define pb push_back
#define popb pop_back
#define fi first
#define sc second
#define pii pair<int,int>
#define all(a) a.begin(),a.end()
#define rall(a) a.begin(),a.end(),greater<int>()
using namespace std;
#define maxn 200005
ll a[maxn];
int main(){
	ios_base::sync_with_stdio(false);cerr.tie(0);cout.tie(0);
    ll n,q,s,t;
    cin >> n >>q>>s>>t;
    for(int i = 0;i<=n;i++) cin >> a[i];
    ll ans = 0;
    for(int i = 0;i<n;i++){
        if(a[i]<a[i+1]){
            ans-=s*(a[i+1]-a[i]);
        }else ans+=t*(a[i]-a[i+1]);
    }

    int l,r,x;
    while(q--){
        cin >> l >> r >> x;
        //cout<<a[l-1]<< " "<<a[l]<< " "<<a[r]<<" "<<a[r+1]<<"\n";
        if(r!=n){
            if(a[r]<a[r+1]){
                ans+=s*(a[r+1]-a[r]);
            }else ans-=t*(a[r]-a[r+1]);
            a[r]+=x;
            if(a[r]<a[r+1]){
                ans-=s*(a[r+1]-a[r]);
            }else ans+=t*(a[r]-a[r+1]);
        }
        if(l==r&&r!=n) a[l]-=x;
        if(a[l]>a[l-1]){
                ans+=s*(a[l]-a[l-1]);
        }else ans-=t*(a[l-1]-a[l]);
        a[l]+=x;
        if(a[l-1]<a[l]){
            ans-=s*(a[l]-a[l-1]);
        }else ans+=t*(a[l-1]-a[l]);
        cout<<ans<<"\n";
    }
    return 0;
}

• Subtask 1: 0 / 30
• Subtask 2: 10 / 10
• Subtask 3: 0 / 60