Submission #947862

#	Time	Username	Problem	Language	Result	Execution time	Memory
947862		pcc	Sum Zero (RMI20_sumzero)	C++17	22 / 100	80 ms	21980 KiB

sumzero

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

#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 mxn = 4e5+10;
ll suf[mxn];
ll N,Q;
int ans = 0;
map<ll,int> mp;
int rp[mxn];
ll dp[mxn][20];
ll arr[mxn];

void solve(){
	int s,e;
	cin>>s>>e;
	e++;
	int ans = 0;
	for(int i = 19;i>=0;i--){
		if(dp[s][i]<=e){
			s = dp[s][i];
			ans += 1<<i;
		}
	}
	cout<<ans<<'\n';
	return;
}

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];
	for(int i = N;i>=1;i--)suf[i] = suf[i+1]+arr[i];
	int mn = mxn-1;
	for(int i = 0;i<20;i++)dp[mxn-1][i] = mxn-1;
	for(int i = N+1;i>=1;i--){
		if(mp.find(suf[i]) != mp.end())mn = min(mn,mp[suf[i]]);
		mp[suf[i]] = i;
		dp[i][0] = mn;
		for(int j = 1;j<20;j++){
			dp[i][j] = dp[dp[i][j-1]][j-1];
		}
	}
	cin>>Q;
	while(Q--)solve();
}

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