Submission #1073524

#	Time	Username	Problem	Language	Result	Execution time	Memory
1073524		jer033	COVID tests (CEOI24_covid)	C++17	97.70 / 100	5039 ms	344 KiB

Main

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

vector<bool> answer(1000, 0);

void answer_clear()
{
    for (int i=0; i<1000; i++)
        answer[i] = 0;
}

bool ask_query(vector<bool> a)
{
    cout << "Q ";
    for (int i=0; i<1000; i++)
        cout << a[i];
    cout << '\n';
    cout.flush();
    char x;
    cin >> x;
    if (x=='P')
        return 1;
    return 0;
}

bool ask_query2(int x, int y)
{
    cout << "Q ";
    for (int i=0; i<x; i++)
        cout << '0';
    for (int i=x; i<=y; i++)
        cout << '1';
    for (int i=y+1; i<1000; i++)
        cout << '0';
    cout << endl;
    char k;
    cin >> k;
    if (k=='P')
        return 1;
    return 0;
}

bool report(vector<bool> a)
{
    cout << "A ";
    for (int i=0; i<1000; i++)
        cout << a[i];
    cout << '\n';
    cout.flush();
    char x;
    cin >> x;
    if (x=='C')
        return 1;
    return 0;
}

long double prob;
bool spec = 0;

int range_first(int x, int y, bool known)
{
    if (x>y)
        return -5;
    bool response;
    if (known)
        response = 1;
    else
        response = ask_query2(x, y);
    
    if (response == 0)
        return -5;
    if (x==y)
    {
        answer[x] = 1;
        return x;
    }
    int z = (x+y)/2;
    if ((z>x) and spec)
        z--;
    int k = range_first(x, z, 0);
    if (k!=-5)
        return k;
    return range_first(z+1, y, 1);
}

void range_query(int x, int y, int m)
{
    int currx = x;
    int curry = y;
    while (currx!=-4)
    {
        currx = range_first(currx, curry, 0);
        currx++;
        if (currx!=-4)
        {
            curry = currx+m-1;
            curry = min(999, curry);
        }
    }
    if (curry!=999)
    {
        currx = curry+1;
        curry = currx+m-1;
        curry = min(999, curry);
        if (m<30)
            if ((curry + (m/2))>999)
                curry = 999;
        range_query(currx, curry, m);
    }
}

void work(int m)
{
    //int curr = 0;
    range_query(0, m-1, m);
    /*bool go_on = 1;
    while (go_on)
    {
        range_query(curr, min(curr+m-1, 999), m);
        if ((curr+m-1)>=999)
            go_on = 0;
        curr+=m;
    }*/
}

int main()
{
    std::ios::sync_with_stdio(false);
    cin.tie(NULL);
    int N, T;
    long double P;
    cin >> N >> P >> T;
    if (T==1)
    {
        while (T--)
        {
            work(1);
            bool L = report(answer);
            if (L==0)
                T = 0;
        }
    }
    else
    {
        prob = P;
        while (T--)
        {
            answer_clear();
            if (P < 0.005)
                work(1000);
            else if (P < 0.01)
                work(200);
            else if (P < 0.02)
                work(125);
            else if (P < 0.03)
                work(30);
            else if (P < 0.05)
                work(16);
            else if (P < 0.10)
            {
                spec = 1;
                work(8);
            }
            else if (P < 0.15)
            {
                spec = 1;
                work(8);
            }
            else if (P < 0.19)
                work(4);
            else
            {
                spec = 1;
                work(3);
            }
            bool L = report(answer);
            if (L==0)
                T = 0;
        }
    }
}

• Subtask 0: 0 / 0
• Subtask 1: 10 / 10
• Subtask 2: 87.699999996 / 90