Submission #874723

#	Time	Username	Problem	Language	Result	Execution time	Memory
874723		Mizo_Compiler	Sum Zero (RMI20_sumzero)	C++17	61 / 100	437 ms	50008 KiB

sumzero

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef double ld;
#define pb push_back
#define sz(x) int(x.size())
#define all(x) x.begin(),x.end()
#define F first
#define S second
const int N = 4e5+5;
int n, a[N], up[N][19];

int main () {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cin >> n;
	map<ll, int> ls;
	ll sum = 0;
	for (int i = 0; i < n; i++) {
		up[i][0] = n;
	}
	up[n][0] = n;
	for (int i = 0; i < n; i++) {
		cin >> a[i];
		ls[sum] = i;
		if (ls.count(sum+a[i])) {
			up[ls[sum+a[i]]][0] = min(up[ls[sum+a[i]]][0], i);
		}
		sum += a[i];
	}
	for (int i = n-2; i >= 0; i--) {
		up[i][0] = min(up[i][0], up[i+1][0]);
	}
	for (int i = 1; i < 19; i++) {
		for (int j = 0; j < n; j++) {
			if (up[j][i-1] == n) {
				up[j][i] = n;	
				continue;
			}
			up[j][i] = up[up[j][i-1]+1][i-1];
		}
		up[n][i] = n;
	}
	int q;
	cin >> q;
	while (q--) {
		int l, r;
		cin >> l >> r;
		--l, --r;
		int cnt = 0;
		for (int i = 18; i >= 0; i--) {
			if (up[l][i] <= r) {
				cnt += (1 << i);
				l = up[l][i]+1;
			}
		}
		cout << cnt << "\n";
	}
}

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