Submission #936598

#	Time	Username	Problem	Language	Result	Execution time	Memory
936598		Xiaoyang	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	91 ms	13332 KiB

foehn_phenomena

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;

#define fi first 
#define se second 
#define pll pair<ll,ll>
#define pb push_back
#define debug(x) cerr<<#x<<"="<<x<<endl;
#define MP make_pair
#define rep(i,a,b) for(ll i=a;i<b;i++)
#define ALL(x) x.begin(),x.end()
#define endl "\n"

const ll maxn=222222;
ll a[maxn],diff[maxn];
ll n,q,s,t;

ll f(ll x){
	if(x>0)return -x*s;
	else return -x*t;
}
int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cin>>n>>q>>s>>t;
	rep(i,0,n+1)cin>>a[i];
	ll ans=0;
	rep(i,1,n+1){
		diff[i]=a[i]-a[i-1];
		//debug(f(diff[i]));
		ans+=f(diff[i]);
	}
	
	//debug(ans);
	while(q--){
		ll l,r,val;
		cin>>l>>r>>val;
		ans-=f(diff[l]);
		diff[l]+=val;
		ans+=f(diff[l]);
		if(r!=n){
			ans-=f(diff[r+1]);
			diff[r+1]-=val;
			ans+=f(diff[r+1]);
		}
		cout<<ans<<endl;
	}
	return 0;
}

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