Submission #950359

#	Time	Username	Problem	Language	Result	Execution time	Memory
950359		TrieTr	Sum Zero (RMI20_sumzero)	C++14	100 / 100	245 ms	17516 KiB

sumzero

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

#define ll long long
#define fastio ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);

const int N = 4e5 + 5;

int n, q, res;
int arr[N];
unordered_map<ll, int> pos;
int nxt[N];
int h[N], jump[N];

void make_leaf(int& id, int& p) {
	h[id] = h[p] + 1;
	if(h[jump[p]] - h[p] == h[jump[jump[p]]] - h[jump[p]]) jump[id] = jump[jump[p]];
	else jump[id] = p;
}
int main() {
    fastio;
    cin >> n;
    for(int i = 1; i <= n; i++) cin >> arr[i];
    ll sum = 0;
    nxt[n + 1] = n + 1;
    pos[0] = n + 1;
    for(int i = n; i > 0; i--) {
    	sum += arr[i];
    	nxt[i] = pos[sum] - 1;
    	nxt[i] = (nxt[i] == -1 ? nxt[i + 1] : min(nxt[i], nxt[i + 1]));
    	pos[sum] = i;
	}
	for(int i = n; i > 0; i--) {
		int u = nxt[i];
		if(h[u] > 0 || u > n) continue;
		int p = nxt[u + 1];
		make_leaf(u, p);
	}
	cin >> q;
	while(q--) {
		int l, r; cin >> l >> r;
		l = nxt[l];
        if(l > r) {cout << "0\n"; continue;}
        res = 0;
		while(l <= r && l != 0) {
			if(jump[l] <= r && jump[l] != 0) {
				res += h[l] - h[jump[l]];
				l = jump[l];
			}
			else {
				res++;
				l = nxt[l + 1];
			}
		}
		cout << res << '\n';
	}
}

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