Submission #1131960

#	Time	Username	Problem	Language	Result	Execution time	Memory
1131960		henriess	Foehn Phenomena (JOI17_foehn_phenomena)	C++20	100 / 100	266 ms	37120 KiB

foehn_phenomena

#include <bits/stdc++.h>
using namespace std;
const long long MOD = 1e9 + 7;
vector<long long> init;
long long n,q,s,t;
struct value{
	pair<long long,long long> currentalt;
	long long temp;
};	
value combine(value v1,value v2){
	value ret;
	ret.temp = v1.temp + v2.temp;
	if (v2.currentalt.first > v1.currentalt.second){
		ret.temp -= s*(v2.currentalt.first - v1.currentalt.second);
	}
	else{ 
		ret.temp += t*(v1.currentalt.second - v2.currentalt.first);
	}
	ret.currentalt = {v1.currentalt.first,v2.currentalt.second};
	return ret;
}

struct node{
	node *left,*right;
	long long S,E,M;
	long long lazy;
	value val;
	node (long long s,long long e):S(s), E(e){
		if (S == E){
			val.currentalt.first = init[S];
			val.currentalt.second = init[S];
			val.temp = 0;
			return;
		}
		M = (S+E)/2;
		left = new node(S,M);
		right = new node(M+1,E);
		
		
		lazy = 0;
		val = combine(left->val,right->val);
	}
	void prop(){
		if (S == E){
			return;
		}
		M = (S + E) / 2;
		
		if (lazy != 0){
			
			left->val.currentalt.first += lazy;
			left->val.currentalt.second += lazy;
			right->val.currentalt.first += lazy;
			right->val.currentalt.second += lazy;
			right->lazy += lazy;
			left->lazy += lazy;
			lazy = 0;
		}
	}
	value qry(long long l,long long r){
		
		if (l <= S && r >= E){
			return val;
		}
		if (r <= M){
			return left->qry(l,r);
		}
		else if(l > M){
			return right->qry(l,r);
		}
		prop();
		return combine(left->qry(l,r), right->qry(l,r));
	}
	void upd(long long l,long long r,long long v){
		if (l > E || r < S){
			return;
		}
		if (l <= S && E <= r){
			
			val.currentalt.first += v ;
			val.currentalt.second += v;
			lazy += v;
			
			return;
		}
		prop();
		left->upd(l,r,v);
		right->upd(l,r,v);
		val = combine(left->val,right->val);
	}
}*segtree;


	
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
	cin >> n >> q >> s >> t;
	init.resize(n+1);
	for(int i = 0;i<=n;i++){
		long long alt;cin >> alt;
		init[i] = alt;
	}
	segtree = new node(0,n);
	long long ans = 0;
	
	while(q--){
		long long l,r,x;cin >> l >> r >> x;
		segtree->upd(l,r,x);
		value change = segtree->qry(0,n);
		ans += change.temp;
		
		cout << ans << '\n';
		ans = 0;
	}
	
		
}

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