Submission #1136819

#	Time	Username	Problem	Language	Result	Execution time	Memory
1136819		Wendidiask	Sum Zero (RMI20_sumzero)	C++20	0 / 100	28 ms	63040 KiB

sumzero

/*
                                     :---:--:--::::::--:-:----:                                     
                               ::-:::.                         ::-:::                               
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             .++=-     +      -=              :*-                                 :-.               
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                                    .:::::::::-::::::--::::::::.                             
 */
 // Hello this is Tyx2019's clone
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define debug(x) cerr << #x << " is " << x << "\n"
#define hehe ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define rep(i, a, b) for (int i = a; i <= b; i++)
#define repb(i, a, b) for (int i = b; i >= a; i--)
#define pii pair<int, int>
#define linebreak cout << "---------------------------------------------------------\n"
#define f first
#define s second
#define pb push_back
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
// good luck
const int MS = 4e5+5, mod = 1e9+9, INF = 3e18, blk = 400;
int n, a[MS], pref[MS], twok[MS][20];
map<int, int> m;
int32_t main() {
	hehe
	cin >> n;
	for (int i = 1; i <= n; i++) cin >> a[i];
	pref[0] = 0;
	for (int i = 1; i <= n; i++) pref[i] = pref[i-1]+a[i];
	for (int i = 1; i <= n; i++) m[pref[i]] = -1;
	m[0] = 0; int macs = 0;
	memset(twok, -1, sizeof(twok));
	for (int i = 1; i <= n; i++) {
		if (m[pref[i]] == -1) {
			m[pref[i]] = i; continue;
		}
		for (int j = macs+1; j <= m[pref[i]]+1; j++) {
			if (twok[j][0] == -1 or twok[j][0] > i) {
				twok[j][0] = i+1;
			}
		}
		macs = m[pref[i]]+1;
		m[pref[i]] = i;
	}
	for (int k = 0; k < 19; k++) {
		for (int i = 1; i <= n; i++) {
			if (twok[i][k] == -1 or twok[i][k] == n+1) twok[i][k+1] = -1;
			else twok[i][k+1] = twok[twok[i][k]][k];
		}
	}
	int q; cin >> q;
	while (q--) {
		int l, r, res = 0; cin >> l >> r;
		for (int k = 19; k >= 0; k--) {
			if (twok[l][k]-1 <= r and twok[l][k] != -1) {
				l = twok[l][k]; res += (1<<k);
			} 
		}
		cout << res << '\n';
	}
}

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