Submission #713605

#	Time	Username	Problem	Language	Result	Execution time	Memory
713605		bin9638	Street Lamps (APIO19_street_lamps)	C++17	20 / 100	1329 ms	141988 KiB

street_lamps

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define pb push_back
#define N 300010
#define ii pair<int,int>
#define fs first
#define sc second
#define ld double

int n,q,a[N];

struct PIT
{
    int goc[N]={},dem=0;

    void init()
    {
        goc[0]=1;
        dem=1;
    }

    struct node
    {
        int l_child=0,r_child=0,sum=0;
    }ST[N*42];

    int update(int l,int r,int i,int val,int oldId)
    {
        if(l>i||r<i)
            return oldId;
        if(l==r)
        {
            dem++;
            ST[dem].sum=val;
            return dem;
        }
        int mid=(l+r)/2,cur=++dem;
        ST[cur].l_child=update(l,mid,i,val,ST[oldId].l_child);
        ST[cur].r_child=update(mid+1,r,i,val,ST[oldId].r_child);
        ST[cur].sum=(ST[ST[cur].l_child].sum+ST[ST[cur].r_child].sum);
        return cur;
    }

    int get(int id,int l,int r,int u,int v)
    {
        if(l>v||r<u)
            return 0;
        if(l>=u&&r<=v)
            return ST[id].sum;
        int mid=(l+r)/2;
        return get(ST[id].l_child,l,mid,u,v)+get(ST[id].r_child,mid+1,r,u,v);
    }
}T;

int main()
{
    #ifdef SKY
    freopen("A.inp","r",stdin);
    freopen("A.out","w",stdout);
    #endif // SKY
    ios::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);
    cin>>n>>q;
    for(int i=1;i<=n;i++)
    {
        char ch;
        cin>>ch;
        a[i]=ch-'0';
    }
    T.init();
    for(int i=1;i<=n;i++)
        T.goc[0]=T.update(1,n,i,a[i],T.goc[0]);
    for(int t=1;t<=q;t++)
    {
        string type;
        cin>>type;
        if(type=="toggle")
        {
            int vt;
            cin>>vt;
            T.goc[t]=T.update(1,n,vt,1,T.goc[t-1]);
        }else
        {
            T.goc[t]=T.goc[t-1];
            int l=0,r=t-1,res=t,u,v;
            cin>>u>>v;
            v--;
            while(l<=r)
            {
                int mid=(l+r)/2;
                if(T.get(T.goc[mid],1,n,u,v)==v-u+1)
                {
                    res=mid;
                    r=mid-1;
                }else
                    l=mid+1;
            }
            cout<<t-res<<"\n";
        }
    }
    return 0;
}

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