Submission #1112654

#	Time	Username	Problem	Language	Result	Execution time	Memory
1112654		_callmelucian	Sum Zero (RMI20_sumzero)	C++14	61 / 100	489 ms	22964 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 + 1;
int nxt[mn][5], last[mn], a[mn];
vector<ll> cmp;

// that's it, no more memory okay?

int travel (int i, int k) { // travel 2^k steps;
    if (k % 4 == 0) return nxt[i][k / 4];
    int cur = travel(i, k - 1);
    return (cur == -1 ? -1 : travel(cur, k - 1));
}

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

    int n; cin >> n;
    ll pre = 0;

    cmp.push_back(0);
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
        pre += a[i], cmp.push_back(pre);
    }
    sort(all(cmp)), filter(cmp);
    fill(last, last + cmp.size(), -1);

    pre = 0, nxt[0][0] = -1;
    for (int i = 0; i <= n; i++) {
        if (i) pre += a[i], nxt[i][0] = nxt[i - 1][0];
        int id = lower_bound(all(cmp), pre) - cmp.begin();
        nxt[i][0] = max(nxt[i][0], last[id]), last[id] = i;
    }

    for (int s = 1; s < 5; s++) {
        for (int i = 0; i <= n; i++) {
            int p = s * 4 - 1, cur = travel(i, p);
            nxt[i][s] = (cur == -1 ? -1 : travel(cur, p));
        }
    }

//    for (int i = 0; i <= n; i++) cout << travel(i, )

    int q; cin >> q;
    for (int i = 0; i < q; i++) {
        int l, r, ans = 0; cin >> l >> r;
        for (int s = 18; s >= 0; s--) {
            int cur = travel(r, s);
            if (l - 1 <= cur) ans |= (1 << s), r = cur;
        }
        cout << ans << "\n";
    }

    return 0;
}

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