Submission #146596

#	Time	Username	Problem	Language	Result	Execution time	Memory
146596		wjoao	Foehn Phenomena (JOI17_foehn_phenomena)	C++11	0 / 100	1055 ms	7896 KiB

foehn_phenomena

#include<bits/stdc++.h>
#define maxn 200100

using namespace std;

struct BIT{
	int v[maxn];
	void update(int x, int val){
		for(; x < maxn; x += x&-x)
			v[x] += val;
	}
	void rangeupdate(int x, int y, int val){
		update(x, val);
		update(y+1, -val);
	}
	int query(int x){
		if( x <= 0 ) return 0;
		if( x >= maxn ) x = maxn-1;

		int sum = 0;
		for(; x > 0; x -= x&-x)
			sum += v[x];
		return sum;
	}
} bit;

int n, q, s, t, res, anterior, atual, L, R, x;

int calc(int a, int b){
  if(a<b) return (a-b)*s;
  else return (a-b)*t;
}

int main(){
  cin >> n >> q >> s >> t;
  n++;
  for(int i = 1; i <= n; i++){
    cin >> atual;
    bit.rangeupdate(i, i, atual);
    res += calc(anterior, atual);
    anterior = atual;
  }
  for(int i = 1; i <= q; i++){
    cin >> L >> R >> x;
    L++; R++;

    res -= calc(bit.query(L-1), bit.query(L));
    if(R+1 <= n){
        res -= calc(bit.query(R), bit.query(R+1));
    }

    bit.rangeupdate(L, R, x);

    res += calc(bit.query(L-1), bit.query(L));
    if(R+1 <= n){
        res += calc(bit.query(R), bit.query(R+1));
    }

    cout << res << endl;
  }


  return 0;
}

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