Submission #742442

#	Time	Username	Problem	Language	Result	Execution time	Memory
742442		anha3k25cvp	Foehn Phenomena (JOI17_foehn_phenomena)	C++14	100 / 100	562 ms	23432 KiB

foehn_phenomena

#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define dl double
#define st first
#define nd second
#define II pair <int, int>

using namespace std;

const int N = 5 + 1e5;
const int inf = 7 + 1e9;

struct segment {
    int n;
    vector <ll> tree, a;
    segment (int _n = 0) : n(_n) {
        tree.assign(4 * n + 1, 0);
        a.assign(4 * n + 1, 0);
    }
    void pull(int l, int r, int node, ll val) {
        tree[node] += val * (r - l + 1);
        a[node] += val;
    }
    void push(int l, int r, int node) {
        if (l < r) {
            int mid = (l + r) / 2;
            pull(l, mid, 2 * node, a[node]);
            pull(mid + 1, r, 2 * node + 1, a[node]);
        }
        a[node] = 0;
    }
    void update(int l, int r, int node, int u, int v, int val) {
        if (r < u || v < l)
            return;
        if (u <= l && r <= v) {
            pull(l, r, node, val);
            return;
        }
        push(l, r, node);
        int mid = (l + r) / 2;
        update(l, mid, 2 * node, u, v, val);
        update(mid + 1, r, 2 * node + 1, u, v, val);
        tree[node] = tree[2 * node] + tree[2 * node + 1];
    }
    ll get(int l, int r, int node, int u) {
        if (r < u || u < l)
            return 0;
        if (l == r)
            return tree[node];
        push(l, r, node);
        int mid = (l + r) / 2;
        return get(l, mid, 2 * node, u) + get(mid + 1, r, 2 * node + 1, u);
    }
};

vector <int> a;

int main() {
#define TASKNAME ""
    ios_base::sync_with_stdio (0);
    cin.tie (0);
    if ( fopen( TASKNAME".inp", "r" ) ) {
        freopen (TASKNAME".inp", "r", stdin);
        freopen (TASKNAME".out", "w", stdout);
    }
    int n, q;
    ll s, t;
    cin >> n >> q >> s >> t;
    n ++;
    a.assign(n + 1, 0);
    segment f(n);
    ll ans = 0;
    for (int i = 1; i <= n; i ++) {
        cin >> a[i];
        f.update(1, n, 1, i, i, a[i]);
        int delta = abs(a[i - 1] - a[i]);
        if (i  > 1)
            ans += (a[i - 1] < a[i] ? -s * delta : t * delta);
    }
    while (q --) {
        int l, r;
        ll x;
        cin >> l >> r >> x;
        l ++; r ++;
        f.update(1, n, 1, l, r, x);
        if (l > 1) {
            ll u = f.get(1, n, 1, l - 1), v = f.get(1, n, 1, l), delta = abs(u - v);
            if (u < v)
                ans -= s * delta;
            else
                ans += t * delta;
            delta = abs(u - v + x);
            if (u < v - x)
                ans += s * delta;
            else
                ans -= t * delta;
        }
        if (r < n) {
            ll u = f.get(1, n, 1, r), v = f.get(1, n, 1, r + 1), delta = abs(u - v);
            if (u < v)
                ans -= s * delta;
            else
                ans += t * delta;
            delta = abs(u - x - v);
            if (u - x < v)
                ans += s * delta;
            else
                ans -= t * delta;
        }
        cout << ans << '\n';
    }
    return 0;
}

Compilation message (stderr)

foehn_phenomena.cpp: In function 'int main()':
foehn_phenomena.cpp:64:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |         freopen (TASKNAME".inp", "r", stdin);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
foehn_phenomena.cpp:65:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |         freopen (TASKNAME".out", "w", stdout);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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