Submission #894644

#	Time	Username	Problem	Language	Result	Execution time	Memory
894644		reginox	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	401 ms	18564 KiB

foehn_phenomena

#include<bits/stdc++.h>
#define ll long long
using namespace std;
const ll maxn = 2e5+3;
struct segtree{
	ll tree[maxn*4], lazy[maxn*4];
	void reset(){
		memset(tree, 0, sizeof(tree));
		memset(lazy, 0, sizeof(lazy));
	}
	void down(ll u){
		ll t = lazy[u];
		tree[u*2]+=t;
		tree[u*2+1]+=t;
		lazy[u*2]+=t;
		lazy[u*2+1]+=t;
		lazy[u]=0;
	}
	void upd(ll id, ll l, ll r, ll u, ll v, ll val){
		if(l>r) return ;
		if(r<u||v<l) return ;
		if(u<=l && v>=r){
			tree[id]+=val;
			lazy[id]+=val;
			return ;
		}
		down(id);
		ll mid = (l+r)>>1;
		upd(id*2, l, mid, u, v, val);
		upd(id*2+1, mid+1, r, u, v, val);
		tree[id]=tree[id*2]+tree[id*2+1];
	}
	ll get(ll id, ll l, ll r, ll u){
		if(u<l||r<u) return 0;
		if(l==r) return tree[id];
		down(id);
		ll mid = (l+r)>>1;
		return get(id*2, l, mid, u) + get(id*2+1, mid+1, r, u);
	}
} tree;
ll n, q, s, t, x, sum, p, l, r, l1, l2, r1, r2, pl1, pl2, pr1, pr2;
int main(){
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	cin >> n >> q >> s >> t;
	for(ll i = 0; i <= n; i++){
		cin >> x;
		if(i==0) continue;
		if(p<x) sum -= (x-p)*s;
		else sum += (p-x)*t;
		tree.upd(1, 1, n, i, i, x);
		p=x;
	}
	while(q--){
		cin >> l >> r >> x;
		// cout << l << " " << r << "\n";
		if(l==1) pl1=0;
		else pl1 = tree.get(1, 1, n, l-1);
		pl2 = tree.get(1, 1, n, l);
		pr1 = tree.get(1, 1, n, r);
		if(r==n) pr2 = pr1;
		else pr2 = tree.get(1, 1, n, r+1);
		// cout << pl1 << " " << pl2 << " " << pr1 << " " << pr2 << "\n";
		
		tree.upd(1, 1, n, l, r, x);
		
		if(l==1) l1=0;
		else l1 = tree.get(1, 1, n, l-1);
		l2 = tree.get(1, 1, n, l);
		r1 = tree.get(1, 1, n, r);
		if(r==n) r2 = r1;
		else r2 = tree.get(1, 1, n, r+1);
		// cout << l1 << " " << l2 << " " << r1 << " " << r2 << "\n";
		
		if(pl1 < pl2){
			if(l1 < l2) sum += ((pl2 - pl1) - (l2 - l1))*s;
			else{
				sum += (pl2 - pl1)*s;
				sum += (l1-l2)*t;
			}
		}
		else{
			if(l1 > l2){
				sum+=((l1-l2) - (pl1-pl2))*t;
			}
			else{
				sum -= (pl1-pl2)*t;
				sum -= (l2 - l1)*s;
			}
		}
		// cout << sum << "\n";
		
		if(pr1 < pr2){
			if(r1 < r2) sum += ((pr2 - pr1) - (r2 - r1))*s;
			else{
				sum += (pr2 - pr1)*s;
				sum += (r1-r2)*t;
			}
		}
		else{
			if(r1 > r2){
				sum+=((r1-r2) - (pr1-pr2))*t;
			}
			else{
				sum -= (pr1-pr2)*t;
				sum -= (r2 - r1)*s;
			}
		}
		
		cout << sum << "\n";
	}
	return 0;
}

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