Submission #1198794

#	Time	Username	Problem	Language	Result	Execution time	Memory
1198794		BigBadBully	COVID tests (CEOI24_covid)	C++17	86.25 / 100	3092 ms	432 KiB

Main

// Online C++ compiler to run C++ program online
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define ff first
#define ss second
int n,t;
bool guess(int l,int r){
    cout << "Q ";
    for (int i = 0; i < n; i++)
    {
        if (i >= l && i <= r)
            cout << '1';
        else
            cout << '0';
    }
    cout << endl;
  
    char la;
    cin >> la;
    if (la == 'P')
        return 1;
    return 0;
}
int calc( int l, int r)
{
    if (l==r)
        return l;
    int mid = l+r>>1;
    if (guess(l,mid))
        return calc(l,mid);
    return calc(mid+1,r);
}

signed main() {
    double p;
    ios::sync_with_stdio(0);
    cin >> n >> p >> t;
    double tte = 1-p;
    int cnt = 1;
    if (tte > 0.5 && p != 0)
    {
    while(tte>0.5)
        tte*=1-p,cnt++;
    if (abs(tte-0.5) > abs(tte/(1-p) - 0.5))
        cnt--;
    }
    while(t--)
    {
        vector<bool> mask(n,0);
        int prev = -1;
        while(prev < n-1)
        if (guess(prev+1,min(n-1,prev+1+cnt)))
            mask[prev = calc(prev+1,min(n-1,prev+1+cnt))] = 1;
        else
            prev = prev+1+cnt;
        cout << "A ";
        for (int i = 0; i < n; i++)
            cout << (char)(mask[i]+'0');
        cout << endl;
        char c;
        cin >> c;
        if(c=='C')
            continue;
        else
            break;
    }
}

• Subtask 0: 0 / 0
• Subtask 1: 10 / 10
• Subtask 2: 76.25 / 90