Submission #974716

#	Time	Username	Problem	Language	Result	Execution time	Memory
974716		Abito	Street Lamps (APIO19_street_lamps)	C++17	20 / 100	203 ms	12624 KiB

street_lamps

#include <bits/stdc++.h>
#define F first
#define S second
#define pb push_back
#define ppb pop_back
#define ep insert
#define endl '\n'
#define elif else if
#define pow pwr
#define sqrt sqrtt
//#define int long long
#define ll long long
typedef unsigned long long ull;
using namespace std;
const int N=3e5+5;
int n,q,seg[4*N+5];
bool a[N];
int build(int x,int l,int r){
    if (l==r){
        if (a[l]) seg[x]=0;
        else seg[x]=q+100;
        return seg[x];
    }
    int mid=(l+r)/2;
    return seg[x]=max(build(x*2,l,mid),build(x*2+1,mid+1,r));
}
void edit(int x,int l,int r,int idx,int val){
    if (l==r){
        seg[x]=val;
        return;
    }int mid=(l+r)/2;
    if (idx<=mid) edit(x*2,l,mid,idx,val);
    else edit(x*2+1,mid+1,r,idx,val);
    seg[x]=max(seg[x*2],seg[x*2+1]);
    return;
}
int query(int x,int l,int r,int lx,int rx){
    if (l>=lx && r<=rx) return seg[x];
    if (l>rx || r<lx) return INT_MIN;
    int mid=(l+r)/2;
    return max(query(x*2,l,mid,lx,rx),query(x*2+1,mid+1,r,lx,rx));
}
int32_t main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
    cin>>n>>q;
    for (int i=1;i<=n;i++){
        char c;cin>>c;
        if (c=='1') a[i]=1;
    }
    build(1,1,n);
    for (int i=1;i<=q;i++){
        string s;cin>>s;
        if (s=="toggle"){
            int x;cin>>x;
            edit(1,1,n,x,i);
        }
        else{
            int l,r;cin>>l>>r;
            cout<<max(0,i-query(1,1,n,l,r-1))<<endl;
        }
    }
    return 0;
}

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