Submission #775069

#	Time	Username	Problem	Language	Result	Execution time	Memory
775069		adaawf	Worst Reporter 3 (JOI18_worst_reporter3)	C++14	100 / 100	1370 ms	26568 KiB

worst_reporter3

#include <iostream>
using namespace std;
long long int n, a[500005], f[500005];
long long int check(long long int x, long long int i) {
    return x / f[i] * f[i] - i;
}
int trya(long long int t, long long int x) {
    int l = 0, r = n, res = -1;
    while (l <= r) {
        int mid = (l + r) / 2;
        if (check(t, mid) >= x) {
            res = mid;
            l = mid + 1;
        }
        else r = mid - 1;
    }
    return res + 1;
}
int main() {
    int q;
    cin >> n >> q;
    f[0] = 1;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
        f[i] = (a[i] + f[i - 1] - 1) / f[i - 1] * f[i - 1];
    }
    for (int jj = 0; jj < q; jj++) {
        long long int t, l, r;
        cin >> t >> l >> r;
        if (t < l) {
            cout << 0 << '\n';
            continue;
        }
        if (t == l) {
            cout << 1 << '\n';
            continue;
        }
        long long int h = trya(t, l), k = trya(t, r + 1);
        cout << h - k << '\n';
    }
}

• Subtask 1: 7 / 7
• Subtask 2: 12 / 12
• Subtask 3: 81 / 81