Submission #670508

#	Time	Username	Problem	Language	Result	Execution time	Memory
670508		S2speed	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	126 ms	13132 KiB

foehn_phenomena

#include<bits/stdc++.h>

using namespace std;

typedef long long ll;

const ll maxn = 2e5 + 17;

struct fentree {

	ll sz;
	vector<ll> val;

	void init(ll n){
		sz = n;
		val.assign(sz , 0);
		return;
	}

	void add(ll i , ll k){
		ll h = i;
		while(h < sz){
			val[h] += k;
			h |= (h + 1);
		}
		return;
	}

	ll cal(ll i){
		ll h = i , res = 0;
		while(~h){
			res += val[h];
			h &= (h + 1); h--;
		}
		return res;
	}

};

ll n , q , s , t;
fentree ft;
ll a[maxn];

ll dif(ll a , ll b){
	return (b > a ? s : t) * (a - b);
}

int main(){
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);

	cin>>n>>q>>s>>t;
	for(ll i = 0 ; i <= n ; i++){
		cin>>a[i];
	}
	ft.init(n + 1);
	for(ll i = 1 ; i <= n ; i++){
		ft.add(i , a[i] - a[i - 1]);
	}
	ll res = 0;
	for(ll i = 1 ; i <= n ; i++){
		res += dif(a[i - 1] , a[i]);
	}
	for(ll e = 0 ; e < q ; e++){
		ll l , r , k;
		cin>>l>>r>>k;
		ll hl = ft.cal(l - 1) , hr = ft.cal(l);
		ll pr = dif(hl , hr) , cur = dif(hl , hr + k);
		res += cur - pr;
		if(r < n){
			hl = ft.cal(r); hr = ft.cal(r + 1);
			pr = dif(hl , hr); cur = dif(hl + k , hr);
			res += cur - pr;
		}
		ft.add(l , k); ft.add(r + 1 , -k);
		cout<<res<<'\n';
	}
	return 0;
}

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