Submission #942640

#	Time	Username	Problem	Language	Result	Execution time	Memory
942640		Tuanlinh123	Sum Zero (RMI20_sumzero)	C++17	0 / 100	10 ms	27380 KiB

sumzero

#include<bits/stdc++.h>
#define ll int
#define pll pair<ll, ll>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define ld long double
#define sz(a) ((ll)(a).size())
using namespace std;

const ll maxn=400005;
long long pre[maxn];
vector <pll> Q[maxn];
vector <ll> crr, A[maxn];
ll a[maxn], to[maxn], last[maxn], ans[maxn];

void dfs(ll u, ll pa)
{
    for (auto [r, id]:Q[u])
        ans[id]=crr.end()-lower_bound(crr.begin(), crr.end(), r, greater<ll>());
    crr.pb(u);
    for (ll v:A[u])
        if (v!=pa)
            dfs(v, u);
    crr.pop_back();
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    ll n; cin >> n;
    vector <long long> num; num.pb(0);
    for (ll i=1; i<=n; i++)
        cin >> a[i], pre[i]=pre[i-1]+a[i], num.pb(pre[i]);
    sort(num.begin(), num.end());
    num.resize(unique(num.begin(), num.end())-num.begin());
    for (ll i=0; i<=n+1; i++) to[i]=n+2, last[i]=-1;
    for (ll i=0; i<=n; i++)
    {
        pre[i]=lower_bound(num.begin(), num.end(), pre[i])-num.begin();
        if (last[pre[i]]!=-1) to[last[pre[i]]]=i+1;
        last[pre[i]]=i+1;
    }
    for (ll i=n; i>=1; i--) to[i]=min(to[i], to[i+1]);
    for (ll i=1; i<=n+1; i++) A[to[i]].pb(i);
    ll q; cin >> q;
    for (ll i=1; i<=q; i++)
    {
        ll l, r; cin >> l >> r;
        Q[l].pb({r+1, i});
    }
    dfs(n+2, n+2);
    for (ll i=1; i<=q; i++)
        cout << ans[i] << "\n";
}

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