Submission #1257041

#	Time	Username	Problem	Language	Result	Execution time	Memory
1257041		nguyn	Sum Zero (RMI20_sumzero)	C++20	61 / 100	242 ms	24052 KiB

sumzero

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

#define ll long long
#define F first
#define S second
#define pb push_back
#define pii pair<int, int>

const int N = 5e5 + 5;

int nxt[N];
int depth[N];
int n, q;
int a[N];
ll p[N];
int jump[N];

map<ll, int> mp;

signed main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cin >> n;
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
		p[i] = p[i - 1] + a[i];
	}
	cin >> q;
	nxt[n + 1] = n + 2;
	nxt[n + 2] = n + 2;
	for (int i = n; i >= 1; i--) {
		mp[p[i]] = i;
		if (mp.count(p[i - 1])) nxt[i] = min(nxt[i + 1], mp[p[i - 1]] + 1);
		else nxt[i] = nxt[i + 1];
//		cout << nxt[i][0] << ' ';
	}
	mp.clear();
	jump[n + 1] = jump[n + 2] = n + 2;
    depth[n + 1] = 0;
    for (int i = n; i >= 1; i--) {
        int p = nxt[i];
        depth[i] = depth[p] + 1;
        if (depth[p] - depth[jump[p]] == depth[jump[p]] - depth[jump[jump[p]]]) jump[i] = jump[jump[p]];
        else jump[i] = p;
    }
	while(q--) {
		int l, r;
		cin >> l >> r;
		assert(r <= n);
		int res = 0;
		while(nxt[l] <= r + 1) {
            if (jump[l] <= r + 1) res += depth[l] - depth[jump[l]], l = jump[l];
            else res++, l = nxt[l];
		}
		cout << res << '\n';
	}

}

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