Submission #257658

#	Time	Username	Problem	Language	Result	Execution time	Memory
257658		trttrttrt	Street Lamps (APIO19_street_lamps)	C++17	0 / 100	1059 ms	12216 KiB

street_lamps

#include <bits/stdc++.h>
typedef long long ll;
using namespace std;
const ll MAX = 2e6;
ll seg[MAX],n,q,m;
ll func2(ll k)
{
    return 1<<(ll)ceil(log2(k));
}
void Merge(ll ind)
{
    seg[ind] = max(seg[2*ind],seg[2*ind+1]);
}
void Edit(ll val,ll loc,ll ind=1,ll l=1,ll r=n)
{
    if (l == r)
    {
        if (l!=loc)
            return ;
        seg[ind] = val;
        return ;
    }
    if (r<l || r<loc || loc<l)
        return ;
    ll mid = (l+r)/2;
    Edit(val,loc,2*ind,l,mid);
    Edit(val,loc,2*ind+1,mid+1,r);
    Merge(ind);
}
ll Ask(ll a,ll b,ll ind=1,ll l=1,ll r=n)
{
    if (b<l || r<a || r<l)
        return -1e18;
    if (a<=l && r<=b)
        return seg[ind];
    ll mid = (l+r)/2;
    ll x = Ask(a,b,2*ind,l,mid);
    ll y = Ask(a,b,2*ind+1,mid+1,r);
    return max(x,y);
}
int main()
{
    cin>>m>>q;
    n = func2(m);
    for (ll i=1; i<=2*n+2; i++)
        seg[i] = -1e18;
    for (ll i=1; i<=m; i++)
    {
        char t;
        cin >> t;
        if (t == '1')
            Edit(0,i);
        else
            Edit(1e18,i);
    }
    ll l,r;
    string s;
    for (ll i=1; i<=q; i++)
    {
        cin>>s>>l;
        if (s == "toggle")
        {
            ll t = Ask(l,l);
            ll ed = (t==1e18 ? i : 1e18);
            Edit(ed,l);
            continue;
        }
        cin>>r;
        ll a = Ask(l,r);
        if (a == 1e18)
            cout<<0;
        else
            cout<<i-a;
        cout<<endl;
    }
    return 0;
}

• Subtask 1: 0 / 20
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 20