Submission #874808

#	Time	Username	Problem	Language	Result	Execution time	Memory
874808		TAhmed33	Sum Zero (RMI20_sumzero)	C++98	22 / 100	296 ms	27196 KiB

sumzero

#include <bits/stdc++.h>
using namespace std;
const int MAXN = 1e5 + 25;
const int inf2 = 17;
#define int long long
#define ll long long 
const ll inf = 1e9;
ll c[MAXN], n;
ll lst[MAXN];
ll pp[MAXN];
ll nxt[inf2][MAXN];
map <ll, ll> dd;
int ans[MAXN];
map <int, vector <int>> ls;
set <pair <int, int>> po;
int dep[MAXN];
signed main () {
//	ios::sync_with_stdio(0); cin.tie(0);
	cin >> n;
	for (int i = 1; i <= n; i++) {
		cin >> c[i];
		c[i] += c[i - 1];
	}
	for (int i = n; i >= 0; i--) {
		lst[i] = dd.count(c[i]) ? dd[c[i]] : inf;
		dd[c[i]] = i;
		int z = ls[c[i]].size();
		if (z >= 2) {
			po.erase({ls[c[i]][z - 2], ls[c[i]][z - 1]});
		}
		z++; ls[c[i]].push_back(i);
		if (z >= 2) {
			po.insert({ls[c[i]][z - 2], ls[c[i]][z - 1]});
		}
		if (po.empty()) pp[i] = inf;
		else pp[i] = (*(po.begin())).second;
	}
	for (int i = n; i >= 0; i--) {
		if (lst[i] == inf) nxt[0][i] = inf;
		else nxt[0][i] = pp[lst[i]];
		dep[i] = (nxt[0][i] == inf ? 1 : 1 + dep[nxt[0][i]]);
	}
	for (int i = 1; i < inf2; i++) for (int j = 0; j <= n; j++) {
		if (nxt[i - 1][j] == inf) { nxt[i][j] = inf; }
		else nxt[i][j] = nxt[i - 1][nxt[i - 1][j]];
	}
	for (int i = 0; i <= n; i++) {
	//	cout << i << ": " << dep[i] << " " << nxt[0][i] << " " << pp[i] << " " << lst[i] << '\n';
	}
	int q;
	cin >> q;
	while (q--) {
		int l, r;
		cin >> l >> r;
		int cur = pp[l - 1];
		if (cur == inf || lst[cur] > r) {
			cout << "0\n";
			continue;
		}
		for (int i = inf2 - 1; i >= 0; i--) {
			if (nxt[i][cur] != inf && nxt[i][cur] <= r) {
				cur = nxt[i][cur];
			}
		}
		int z = -dep[cur] + dep[pp[l - 1]];
		if (lst[cur] <= r) cur = lst[cur], z++;
		cout << z << '\n';
	}
}
	

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