Submission #928981

#	Time	Username	Problem	Language	Result	Execution time	Memory
928981		fdnfksd	Sum Zero (RMI20_sumzero)	C++14	61 / 100	1037 ms	15312 KiB

sumzero

#include<bits/stdc++.h>
#define pb push_back
#define pli pair<int,int>
#define fi first
#define se second
#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL);
using namespace std;
using ll=long long;
const ll maxn=4e5+5;
const ll inf=1e18;
const ll mod=1e9+7;
ll n;
pair<ll,int> a[maxn];
int nxt[maxn],mn[maxn],p[maxn],jump[maxn];
const ll block=630;
void solve()
{
    cin >> n;
    for(int i=1;i<=n;i++) cin >> a[i].fi,a[i].fi+=a[i-1].fi,a[i].se=i;
    sort(a,a+n+1);
    for(int i=0;i<=n;i++)
    {
        if(i<n&&a[i].fi==a[i+1].fi) nxt[a[i].se+1]=a[i+1].se;
        else nxt[a[i].se+1]=n+1;
    }
    nxt[n+1]=n+1;
    mn[n+1]=n+1;
    for(int i=n;i>=1;i--)
    {
        if(nxt[i]<nxt[mn[i+1]]) mn[i]=i;
        else mn[i]=mn[i+1];
    }
    for(int i=n;i>=1;i--)
    {
        ll u=nxt[i];
        if(u==n+1) p[i]=n+1;
        else u++,p[i]=mn[u];
    }
    p[n+1]=n+1;
    for(int i=1;i<=n;i++)
    {
        ll cnt=0;
        ll u=i;
        while(cnt<block)
        {
            u=p[u];
            cnt++;
            if(u==n+1) break;
        }
        jump[i]=u;
    }
    ll q;
    cin >> q;
    for(int i=1;i<=q;i++)
    {
        int l,r;
        cin >> l >> r;
        l=mn[l];
        if(nxt[l]>r) {cout << 0 << '\n';continue;}
        else
        {
            ll ans=1;
            while(nxt[jump[l]]<=r)
            {
                ans+=block;
                l=jump[l];
            }
            while(nxt[p[l]]<=r)
            {
                ans++;
                l=p[l];
            }
            cout << ans << '\n';
        }
    }
}
int main()
{
    fastio
    //freopen(TASKNAME".INP","r",stdin);
    //freopen(TASKNAME".OUT","w",stdout);
    solve();
}

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