Submission #1098286

#	Time	Username	Problem	Language	Result	Execution time	Memory
1098286		Nelt	Sum Zero (RMI20_sumzero)	C++17	61 / 100	197 ms	26748 KiB

sumzero

// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx,avx2,fma")
#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>
// #define ll long long
// #define endl "\n"

using namespace std;
// using namespace __gnu_pbds;

// mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
// template <typename T, typename key = less<T>>
// using ordered_set = tree<T, null_type, key, rb_tree_tag, tree_order_statistics_node_update>;
const int lg = 19, N = 4e5 + 5;
int up[N], nxt[N], l[N], r[N], a[N], ans[N];
void solve()
{
    int n;
    cin >> n;
    for (int i = 1; i <= n; i++)
        cin >> a[i];
    unordered_map<long long, int> last;
    int mn = n + 1;
    long long sum = 0;
    last[0] = n + 1;
    for (int i = n; i >= 1; i--)
    {
        last[sum] = i;
        sum += a[i];
        if (last.count(sum))
            mn = min(mn, last[sum]);
        nxt[i] = mn + 1;
    }
    // last.clear();
    for (int i = 1; i <= n; i++) a[i] = 0;
    nxt[n + 1] = nxt[n + 2] = n + 2;
    // for (int i = 1; i <= n; i++) cout << up[0][i] << " \n"[i == n];
    int q;
    cin >> q;
    for (int i = 0; i < q; i++)
        cin >> l[i] >> r[i], ans[i] = 0;
    for (int bit = lg - 1; bit >= 0; bit--)
    {
        for (int i = 1; i <= n + 2; i++)
            up[i] = nxt[i];
        for (int x = 0; x < bit; x++)
            for (int i = 1; i <= n; i++)
                up[i] = up[up[i]];
        for (int i = 0; i < q; i++)
            if (up[l[i]] <= r[i] + 1)
                ans[i] += 1 << bit, l[i] = up[l[i]];
    }
    for (int i = 0; i < q; i++) cout << ans[i] << "\n";
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int t = 1;
    // precomp();
    // cin >> t;
    for (int cs = 1; cs <= t; cs++)
        solve();
    // cerr << "\nTime elapsed: " << clock() * 1000.0 / CLOCKS_PER_SEC << " ms\n";
}

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