Submission #129312

#	Time	Username	Problem	Language	Result	Execution time	Memory
129312		taozai281	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	30 / 100	1004 ms	5020 KiB

foehn_phenomena

#include<bits/stdc++.h>
using namespace std;
#define int long long
int n,q,s,t;
int a[200010];
int b[200010];
int l,r,x;
long long res=0;
int cal(int x){
	if(x<0){
		return x*s;
	}
	else return x*t;
}
signed main(){
	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-1]-a[i];
		res+=cal(b[i]);
	}
	
	while(q--){
      cin>>l>>r>>x;
        res -= cal(b[l]);
        b[l] -= x;
        res += cal(b[l]);
        if (r < n) {
            res -= cal(b[r + 1]);
            b[r + 1] += x;
            res += cal(b[r + 1]);
        }
		cout<<res<<endl;
	}
	
	
}

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