Submission #1044240

#	Time	Username	Problem	Language	Result	Execution time	Memory
1044240		gagik_2007	COVID tests (CEOI24_covid)	C++17	80.61 / 100	7054 ms	2344 KiB

Main

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

#define ff first
#define ss second

ll ttt;
const ll INF=1e18;
const ll MOD=1e9+7;
const ll N=5007;
ll n,m,k;
double p;
map<string, int>d;
int DIV=100;

bool query(string s){
    if(d[s]){
        if(d[s]==1){
            return false;
        }
        return true;
    }
    cout<<"Q "<<s<<endl;
    char res;
    cin>>res;
    bool ress=false;
    if(res=='P'){
        ress=true;
    }
    d[s]=ress+1;
    return ress;
}

bool queryRange(int l, int r){
    string s="";
    for(int i=0;i<l;i++){
        s+='0';
    }
    for(int i=l;i<=r;i++){
        s+='1';
    }
    for(int i=r+1;i<n;i++){
        s+='0';
    }
    return query(s);
}

int findNextPositive(int from, int to){
    if(!queryRange(from, to)){
        return to+1;
    }
    int l=from;
    int r=to;
    while(l<r){
        int mid=(l+r)/2;
        if(queryRange(l, mid)){
            r=mid;
        }
        else{
            l=mid+1;
        }
    }
    return l;
}

void clear(){
    d.clear();
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    // freopen("Binput.txt","r",stdin);
    // freopen("Boutput.txt","w",stdout);
    cin>>n>>p>>ttt;
    if(p<0.005){
        DIV=1;
    }
    else if(p<0.02){
        DIV=10;
    }
    else if(p<0.03){
        DIV=33;
    }
    else if(p<0.05){
        DIV=50;
    }
    else if(p<0.1){
        DIV=90;
    }
    else if(p<0.15){
        DIV=125;
    }
    else if(p<0.18){
        DIV=250;
    }
    else{
        DIV=350;
    }
    while(ttt--){
        clear();
        string ans="";
        for(int i=0;i<n;i++){
            ans+='0';
        }
        for(int fromm=0;fromm<n;fromm+=n/DIV){
            int from=fromm;
            int to=min(from+n/DIV-1,n-1);
            while(true){
                int ind=findNextPositive(from,to);
                if(ind==to+1){
                    break;
                }
                from=ind+1;
                ans[ind]='1';
                if(from>=to+1)break;
            }
        }
        cout<<"A "<<ans<<endl;
        char c;
        cin>>c;
        if(c=='W'){
            return 0;
        }
    }
}

• Subtask 0: 0 / 0
• Subtask 1: 10 / 10
• Subtask 2: 70.610000004 / 90