Submission #1011428

#	Time	Username	Problem	Language	Result	Execution time	Memory
1011428		thinknoexit	Fish 3 (JOI24_fish3)	C++17	37 / 100	551 ms	64424 KiB

Main

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int N = 300300;
int n;
ll a[N], b[N], p[N], ans[N];
ll qs[N];
ll tree[4 * N], lazy[4 * N];
ll mn[4 * N];
void build(int now = 1, int l = 1, int r = n) {
    if (l == r) {
        mn[now] = a[l];
        return;
    }
    int mid = (l + r) / 2;
    build(2 * now, l, mid), build(2 * now + 1, mid + 1, r);
    mn[now] = min(mn[2 * now], mn[2 * now + 1]);
}
ll qmn(int ql, int qr, int now = 1, int l = 1, int r = n) {
    if (l > qr || r < ql) return 1e18;
    if (ql <= l && r <= qr) return mn[now];
    int mid = (l + r) / 2;
    return min(qmn(ql, qr, 2 * now, l, mid), qmn(ql, qr, 2 * now + 1, mid + 1, r));
}
void lzy(int now, int l, int r) {
    if (lazy[now] == -1) return;
    tree[now] = lazy[now] * (r - l + 1);
    if (l != r) lazy[2 * now] = lazy[2 * now + 1] = lazy[now];
    lazy[now] = -1;
}
void update(int ql, int qr, ll w, int now = 1, int l = 1, int r = n) {
    lzy(now, l, r);
    if (l > qr || r < ql) return;
    if (ql <= l && r <= qr) {
        lazy[now] = w;
        lzy(now, l, r);
        return;
    }
    int mid = (l + r) / 2;
    update(ql, qr, w, 2 * now, l, mid), update(ql, qr, w, 2 * now + 1, mid + 1, r);
    tree[now] = tree[2 * now] + tree[2 * now + 1];
}
ll query(int ql, int qr, int now = 1, int l = 1, int r = n) {
    lzy(now, l, r);
    if (l > qr || r < ql) return 0ll;
    if (ql <= l && r <= qr) return tree[now];
    int mid = (l + r) / 2;
    return query(ql, qr, 2 * now, l, mid) + query(ql, qr, 2 * now + 1, mid + 1, r);
}
vector<pair<int, int>> Q[N];
int main() {
    cin.tie(nullptr)->sync_with_stdio(false);
    memset(lazy, -1, sizeof lazy);
    ll d;
    cin >> n >> d;
    for (int i = 1;i <= n;i++) {
        // c[i] = d * a[i] + b[i]
        ll c;
        cin >> c;
        a[i] = c / d;
        b[i] = c % d;
    }
    for (int i = 2;i <= n;i++) {
        p[i] = p[i - 1];
        if (b[i - 1] > b[i]) p[i]++;
    }
    for (int i = 1;i <= n;i++) {
        a[i] -= p[i];
        qs[i] = qs[i - 1] + a[i];
    }
    build();
    int q;
    cin >> q;
    for (int i = 1;i <= q;i++) {
        int l, r;
        cin >> l >> r;
        Q[r].push_back({ l, i });
    }
    // do like subtask 3
    int pre = 1;
    stack<pair<ll, int>> st;
    for (int i = 1;i <= n;i++) {
        while (!st.empty() && st.top().first >= a[i]) {
            st.pop();
        }
        if (st.empty()) update(1, i, a[i]);
        else update(st.top().second + 1, i, a[i]);
        st.push({ a[i], i });
        for (auto& x : Q[i]) {
            if (qmn(x.first, i) + p[x.first] < 0) {
                ans[x.second] = -1;
                continue;
            }
            ans[x.second] = qs[i] - qs[x.first - 1] - query(x.first, i);
        }
    }
    for (int i = 1;i <= q;i++) {
        cout << ans[i] << '\n';
    }
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:80:9: warning: unused variable 'pre' [-Wunused-variable]
   80 |     int pre = 1;
      |         ^~~

• Subtask 1: 9 / 9
• Subtask 2: 0 / 7
• Subtask 3: 28 / 28
• Subtask 4: 0 / 20
• Subtask 5: 0 / 36