Submission #885494

#	Time	Username	Problem	Language	Result	Execution time	Memory
885494		vjudge1	Foehn Phenomena (JOI17_foehn_phenomena)	C++17	100 / 100	515 ms	13888 KiB

foehn_phenomena

#include <bits/stdc++.h>
using namespace std;

#define endl '\n'
#define db double
#define ll __int128
#define int long long
#define pb push_back
#define fs first
#define sd second
#define Mod long(1e9 + 7)
#define all(x) x.begin(), x.end()
#define unvisited long(-1)
#define Eps double(1e-9)
#define _for(i, n) for(int i = 0; i < (n); i++)
#define dbg(x) cout << #x ": " << x << endl;

const int Max = 1e6 + 7, Inf = 1e15 + 7;

void print(bool x) { cout << (x ? "YES" : "NO") << endl; }

string tostring (__int128 x)
{
    string ans = "";
    while(x > 0)
    {
        ans += (x % 10 + '0');
        x /= 10;
    }
    reverse(all(ans));
    return ans;
}

int ans = 0, n, q, s, t; 

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

struct SegmentTreeLazy
{
    struct node
    {
        int value, lazy;

        node(int v = 0)
        {
            value = v;
            lazy = -Inf;
        }
    };

    vector <node> tree; int l;

    void update(int v, int s, int e, int k)
    {
        if(tree[v].lazy == -Inf) tree[v].lazy = 0; 
        tree[v].lazy += k;
        tree[v].value += (e - s + 1) * k;
    }

    void push(int v, int s, int e)
    {
        if (tree[v].lazy != -Inf)
        {
            int middle = (s + e) / 2;

            update(2 * v, s, middle, tree[v].lazy);
            update(2 * v + 1, middle + 1, e, tree[v].lazy);

            tree[v].lazy = -Inf;
        }
    }

    void increase(int node, int v, int x, int y, int s, int e)
    {
        if (x > e || y < s) return;

        if (s >= x && e <= y)
        {
            update(node, s, e, v);
            return;
        }

        push(node, s, e);

        int middle = (s + e) / 2;

        increase(node * 2, v, x, y, s, middle);
        increase(node * 2 + 1, v, x, y, middle + 1, e);

        tree[node].value = tree[node * 2].value
            + tree[node * 2 + 1].value;
    }

    void increase(int x, int y, int v) { increase(1, v, x, y, 1, l); }

    int sum(int node, int x, int y, int s, int e)
    {
        if (x > e || y < s) return 0;

        if (s >= x && e <= y)
            return tree[node].value;

        push(node, s, e);
        int middle = (s + e) / 2;

        return sum(node * 2, x, y, s, middle) +
            sum(node * 2 + 1, x, y, middle + 1, e);
    }

    int query(int x) { return sum(1, x, x, 1, l); }

    SegmentTreeLazy(int n)
    {
        for (l = 1; l < n; l = (l << 1));
        tree.resize(2 * l);
    }
};

void solve()
{
    cin >> n >> q >> s >> t; 
    SegmentTreeLazy St(n+2); 
    vector <int> v(n+1); 
    
    for(int i = 0; i <= n; i++)
    {
        cin >> v[i]; 
        St.increase(i+1, i+1, v[i]); 
        if(i != 0) ans += f(v[i-1], v[i]); 
    }

    //cerr << ans << endl; 

    while (q--)
    {
        int l, r, x, a, b, c, d; cin >> l >> r >> x; l++; r++; 

        a = St.query(l-1), b = St.query(l), c = St.query(r), d = St.query(r+1); 
        ans -= f(a, b); if(r != n+1) ans -= f(c, d); 

        St.increase(l, r, x);

        a = St.query(l-1), b = St.query(l), c = St.query(r), d = St.query(r+1); 
        ans += f(a, b); if(r != n+1) ans += f(c, d); 

        cout << ans << endl; 

        /*cout << endl; 
        for(int i = 1; i <= n+1; i++)
            cout << St.query(i) << " "; 
        break; */
    }
}

int32_t main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int Q = 1; //cin >> Q;

    while (Q--)
    {
        solve();
    }

    return 0;
}

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