Submission #947883

#	Time	Username	Problem	Language	Result	Execution time	Memory
947883		pcc	Sum Zero (RMI20_sumzero)	C++17	100 / 100	195 ms	19068 KiB

sumzero

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

#pragma GCC target("avx2,popcnt")
#pragma GCC optimize("O3,unroll-loops")

#define ll long long
#define pll pair<ll,ll>
#define pii pair<int,int>
#define fs first
#define sc second
#define tlll tuple<ll,ll,ll>

const int B = 18;
const int mxn = 4e5+10;
int N,Q;
int dp[mxn];
int arr[mxn];
int ans[mxn];
pii req[mxn];
bool roll;

void calc(int lvl){
	roll = 0;
	for(int i = 1;i<=N+1;i++)dp[i] = arr[i];
	dp[mxn-1] = mxn-1;
	for(int i = 0;i<lvl;i++){
		roll ^= 1;
		for(int j = 1;j<=N+1;j++){
			dp[j] = dp[dp[j]];
		}
	}
	for(int i = 1;i<=Q;i++){
		auto &[s,e] = req[i];
		if(dp[s]<=e+1){
			ans[i] += 1<<lvl;
			s = dp[s];
		}
	}
	return;
}

unordered_map<ll,int> mp;
int main(){
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	cin>>N;
	for(int i = 1;i<=N;i++){
		cin>>arr[i];
	}
	int mn = mxn-1;
	ll sum = 0;
	for(int i = N+1;i>=1;i--){
		sum += arr[i];
		if(mp.find(sum) != mp.end())mn = min(mn,mp[sum]);
		mp[sum] = i;
		arr[i] = mn;
	}
	cin>>Q;
	for(int i = 1;i<=Q;i++){
		cin>>req[i].fs>>req[i].sc;
	}
	for(int i = B-1;i>=0;i--)calc(i);
	for(int i = 1;i<=Q;i++){
		cout<<ans[i]<<'\n';
	}
	return 0;
}

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