Submission #778668

#	Time	Username	Problem	Language	Result	Execution time	Memory
778668		borisAngelov	Sum Zero (RMI20_sumzero)	C++17	61 / 100	1082 ms	12480 KiB

sumzero

#include <bits/stdc++.h>

using namespace std;

const int maxn = 400005;
const int inf = 1e9;

int n, q;

int a[maxn];

pair<long long, int> suffix[maxn];

int nxt[maxn];

void fastIO()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
}

int main()
{
    fastIO();

    cin >> n;

    for (int i = 1; i <= n; ++i)
    {
        cin >> a[i];
    }

    suffix[n + 1] = make_pair(0LL, n + 1);

    for (int i = n; i >= 1; --i)
    {
        suffix[i].first = suffix[i + 1].first + a[i];
        suffix[i].second = i;
    }

    sort(suffix + 1, suffix + n + 2);

    for (int i = n + 1; i >= 1; --i)
    {
        nxt[i] = inf;
    }

    for (int i = 1; i <= n; ++i)
    {
        if (suffix[i].first == suffix[i + 1].first)
        {
            nxt[suffix[i].second] = suffix[i + 1].second;
        }
    }

    for (int i = n; i >= 1; --i)
    {
        nxt[i] = min(nxt[i], nxt[i + 1]);
    }

    cin >> q;

    for (int i = 1; i <= q; ++i)
    {
        int l, r;
        cin >> l >> r;

        ++r;

        int ans = 0;

        while (true)
        {
            int newl = nxt[l];

            if (newl > r)
            {
                break;
            }

            ++ans;
            l = newl;
        }

        cout << ans << "\n";
    }

    return 0;
}

• Subtask 1: 22 / 22
• Subtask 2: 39 / 39
• Subtask 3: 0 / 39