Submission #701897

#	Time	Username	Problem	Language	Result	Execution time	Memory
701897		tamthegod	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	385 ms	18252 KiB

foehn_phenomena

// Make the best become better
// No room for laziness
#include<bits/stdc++.h>

#define int long long
#define pb push_back
#define fi first
#define se second
using namespace std;
using ll = long long;
using ld = long double;
using ull = unsigned long long;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int maxN = 1e6 + 5;
const int mod = 1e9 + 7;
const ll oo = 1e18;
int n, q, s, t;
int a[maxN];
int res = 0;
int st[4 * maxN], lazy[4 * maxN];
void down(int id)
{
    int t = lazy[id];
    lazy[id] = 0;
    st[id * 2] += t;
    lazy[id * 2] += t;
    st[id * 2 + 1] += t;
    lazy[id * 2 + 1] += t;
}
void build(int id, int l, int r)
{
    if(l == r)
    {
        st[id] = a[l];
        return;
    }
    int mid = (l + r) / 2;
    build(id * 2, l, mid);
    build(id * 2 + 1, mid + 1, r);
}
void update(int id, int l, int r, int u, int v, int val)
{
    if(l > v || r < u) return;
    if(l >= u && r <= v)
    {
        st[id] += val;
        lazy[id] += val;
        return;
    }
    int mid = (l + r) / 2;
    down(id);
    update(id * 2, l, mid, u, v, val);
    update(id * 2 + 1, mid + 1, r, u, v, val);
}
int get(int id, int l, int r, int pos)
{
    if(l == r) return st[id];
    int mid = (l + r) / 2;
    down(id);
    if(pos <= mid) return get(id * 2, l, mid, pos);
    return get(id * 2 + 1, mid + 1, r, pos);
}
void ReadInput()
{
    cin >> n >> q >> s >> t;
    for(int i=0; i<=n; i++)
        cin >> a[i];
    for(int i=1; i<=n; i++)
    {
        if(a[i] >= a[i - 1]) res -= (a[i] - a[i - 1]) * s;
        else res += (a[i - 1] - a[i]) * t;
    }
}
void Solve()
{
    build(1, 0, n);
    while(q--)
    {
        int l, r, x;
        cin >> l >> r >> x;
        int val1 = get(1, 0, n, l), val2 = get(1, 0, n, l - 1);
        if(val1 >= val2) res += s * (val1 - val2);
        else res -= t * (val2 - val1);
        if(r < n)
        {
            int val1 = get(1, 0, n, r), val2 = get(1, 0, n, r + 1);
            if(val2 >= val1) res += s * (val2 - val1);
            else res -= t * (val1 - val2);
        }
        update(1, 0, n, l, r, x);
        val1 = get(1, 0, n, l), val2 = get(1, 0, n, l - 1);
        if(val1 >= val2) res -= s * (val1 - val2);
        else res += t * (val2 - val1);
        if(r < n)
        {
            int val1 = get(1, 0, n, r), val2 = get(1, 0, n, r + 1);
            if(val2 >= val1) res -= s * (val2 - val1);
            else res += t * (val1 - val2);
        }
        cout << res << '\n';
    }
}
int32_t main()
{
   // freopen("sol.inp", "r", stdin);
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    ReadInput();
    Solve();
}

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