Submission #1112584

#	Time	Username	Problem	Language	Result	Execution time	Memory
1112584		_callmelucian	Sum Zero (RMI20_sumzero)	C++14	61 / 100	243 ms	28584 KiB

sumzero

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef long double ld;
typedef pair<ll,ll> pl;
typedef pair<int,int> pii;
typedef tuple<int,int,int> tpl;

#define all(a) a.begin(), a.end()
#define filter(a) a.erase(unique(all(a)), a.end())

const int mn = 4e5 + 5;
int nxt[mn], ans[mn], qryL[mn], qryR[mn], calc[2][mn];

int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);

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

    map<ll,int> last;
    last[0] = 0, nxt[0] = -1;

    int nearest = -1;
    for (int i = 1; i <= n; i++) {
        if (last.count(pre[i]))
            nearest = max(nearest, last[pre[i]]);
        last[pre[i]] = i, nxt[i] = nearest;
    }

    int q; cin >> q;
    for (int i = 0; i < q; i++) {
        cin >> qryL[i] >> qryR[i];
        qryL[i]--;
    }
    for (int s = 18; s >= 0; s--) {
        for (int i = 0; i <= n; i++) calc[0][i] = nxt[i];
        for (int j = 1; j <= s; j++) {
            int t = j & 1;
            for (int i = 0; i <= n; i++)
                calc[t][i] = (calc[t ^ 1][i] == -1 ? -1 : calc[t ^ 1][calc[t ^ 1][i]]);
        }

        for (int i = 0; i < q; i++)
            if (qryL[i] <= calc[s & 1][qryR[i]]) ans[i] |= (1 << s), qryR[i] = calc[s & 1][qryR[i]];
    }

    for (int i = 0; i < q; i++) cout << ans[i] << "\n";

    return 0;
}

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