Submission #1060736

#	Time	Username	Problem	Language	Result	Execution time	Memory
1060736		Dan4Life	COVID tests (CEOI24_covid)	C++17	0 / 100	1 ms	344 KiB

Main

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) begin(a), end(a)
using ll = long long;
using vi = vector<int>;
using ar2 = array<int,2>;
using ar3 = array<int,3>;
using ar4 = array<int,4>;
const int INF = (int)2e9;
const int mxN = (int)1e3+10;

int N;
double P;
bitset<mxN> answer, test;

bool test_students() {
	cout << "Q ";
	for(int i = 0; i < N; i++) cout << test[i];
	cout << endl; char c; cin >> c; return (c=='P');
}

/// You should implement:

// This function will be called once for each test instance.
// It should use test_students to determine which samples are positive.
// It must return a vector of Booleans of length N,
// where the i-th element is true if and only if the i-th sample is positive.
void find_positive() {
	answer.reset(), test.reset();
	int l = 0;
	while(l<N){
		test>>=l; test.set(); test<<=l;
		if(!test_students()) break;
		test.reset();
		int r = N-1, oldL = l;
		while(l<r){
			int mid = (l+r)/2;
			test>>=oldL; test&=((1<<(mid-oldL+2))-1);
			test<<=oldL;
			if(test_students()) r=mid;
			else l=mid+1;
			test.reset();
		}
		answer[l]=1; l++;
	}
}

int main() {
    int T; cin >> N >> P >> T;

    // You may perform any extra initialization here.

    for (int i = 0; i < T; i++) {
		find_positive();
		cout << "A ";
		for(int i = 0; i < N; i++) cout << answer[i];
		cout << endl;
        char verdict; cin >> verdict;
        if (verdict == 'W') exit(0);
    }
    return 0;
}

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