Submission #1177121

#	Time	Username	Problem	Language	Result	Execution time	Memory
1177121		altern23	Sum Zero (RMI20_sumzero)	C++17	22 / 100	90 ms	25156 KiB

sumzero

#include <bits/stdc++.h>
using namespace std;
 
#define ll long long
#define pii pair<ll, ll>
#define fi first
#define sec second
#define ld long double

const int MAXN = 1e5;
const ll INF = 4e18;
const int MOD = 1e9 + 7;

int main(){
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	int tc = 1;	
	// cin >> tc;	
	for(;tc--;){
		ll N; cin >> N;
		vector<ll> a(N + 5), ps(N + 5);
		for(int i = 1; i <= N; i++){
			cin >> a[i];
			ps[i] = ps[i - 1] + a[i];
		}
		
		vector<vector<ll>> up(N + 5, vector<ll>(20));
		map<ll, ll> mp;
		vector<ll> dp(N + 5, N + 1);

		for(int i = N; i >= 0; --i){
			dp[i] = dp[i + 1];
			if(mp.count(ps[i])){
				dp[i] = min(dp[i], mp[ps[i]]);
			}
			mp[ps[i]] = i;
			up[i][0] = dp[i];
		}
		
		for(int LOG = 0; LOG < 20; LOG++){
			up[N + 1][LOG] = N + 1;
		}
		for(int LOG = 1; LOG < 20; LOG++){
			for(int i = 0; i <= N; i++){
				up[i][LOG] = up[up[i][LOG - 1]][LOG - 1];
			}
		}
		
		ll Q; cin >> Q;
		for(int i = 1; i <= Q; i++){
			ll l, r; cin >> l >> r;
			ll cur = l - 1, ans = 0;
			for(int LOG = 19; LOG >= 0; --LOG){
				if(up[cur][LOG] <= r){
					ans += (1LL << LOG);
					cur = up[cur][LOG];
				}
			}
			cout << ans << "\n";
		}
	}   
	
}

/*

*/

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