Submission #359228

#	Time	Username	Problem	Language	Result	Execution time	Memory
359228		Pety	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	182 ms	13420 KiB

foehn_phenomena

#include <bits/stdc++.h>


using namespace std;

ifstream fin ("echilibru.in");
ofstream fout ("echilibru.out");

typedef long long ll;
int n, q;
ll aib[200002], a[200002], s, t;

ll query (int x) {
  ll s = 0;
  for (int i = x; i; i -= (i & -i))
    s += aib[i];
  return s;
}
void update (int x, ll val) {
  if (x > n)
    return;
  for (int i = x; i <= n; i += (i & -i))
    aib[i] += val;
}



int main()
{
  ios_base::sync_with_stdio(false);
  cin.tie(0); cout.tie(0);
  cin >> n >> q >> s >> t;
  n++;
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
    update(i, a[i]);
    update(i + 1, -a[i]);
  }
  ll sum = 0;
  for (int i = 1; i < n; i++) {
    if (a[i] < a[i + 1])
      sum += (a[i] - a[i + 1]) * s;
    else
      sum += (a[i] - a[i + 1]) * t;
  }
  ll l, r, x;
  while (q--) {
    cin >> l >> r >> x;
    l++;r++;
    if (l > 1) {
      ll val1 = query(l), val2 = query(l - 1);
      if (val2 < val1)
        sum -= (val2 - val1) * s;
      else
        sum -= (val2 - val1) * t;
    }
    if (r < n) {
      ll val1 = query(r + 1), val2 = query(r);
      if (val2 < val1)
        sum -= (val2 - val1) * s;
      else
        sum -= (val2 - val1) * t;
    }
    update(l, x);
    update(r + 1, -x);
    if (l > 1) {
      ll val1 = query(l), val2 = query(l - 1);
      if (val2 < val1)
        sum += (val2 - val1) * s;
      else
        sum += (val2 - val1) * t;
    }
    if (r < n) {
      ll val1 = query(r + 1), val2 = query(r);
      if (val2 < val1)
        sum += (val2 - val1) * s;
      else
        sum += (val2 - val1) * t;
    }
    cout << sum << "\n";
  }
  return 0;
}

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