Submission #456381

#	Time	Username	Problem	Language	Result	Execution time	Memory
456381		AdamGS	Sum Zero (RMI20_sumzero)	C++11	61 / 100	130 ms	65540 KiB

sumzero

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define rep(a, b) for(int a = 0; a < (b); ++a)
#define st first
#define nd second
#define pb push_back
#define all(a) a.begin(), a.end()
const int LIM=4e5+7, LG=19;
ll nxt[LIM][LG];
map<ll,ll>mp;
int main() {
	ios_base::sync_with_stdio(0); cin.tie(0);
	int n;
	cin >> n;
	ll sum=0;
	rep(i, n) {
		cin >> nxt[i+1][0];
		sum+=nxt[i+1][0];
	}
	for(int i=n; i>=0; --i) {
		ll a=nxt[i][0];
		nxt[i][0]=0;
		if(!mp[sum]) nxt[i][0]=n+1;
		else nxt[i][0]=mp[sum];
		mp[sum]=i;
		sum-=a;
		if(i<n) nxt[i][0]=min(nxt[i][0], nxt[i+1][0]);
	}
	mp.clear();
	rep(i, LG) nxt[n+1][i]=n+1;
	for(int j=1; j<LG; ++j) {
		rep(i, n+1) nxt[i][j]=nxt[nxt[i][j-1]][j-1];
	}
	int q;
	cin >> q;
	while(q--) {
		int l, r;
		cin >> l >> r; --l;
		int ans=0;
		for(int i=LG-1; i>=0; --i) if(nxt[l][i]<=r) {
			ans+=1<<i;
			l=nxt[l][i];
		}
		cout << ans << '\n';
	}
}

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