Submission #1134423

#	Time	Username	Problem	Language	Result	Execution time	Memory
1134423		ReLice	COVID tests (CEOI24_covid)	C++20	0 / 100	0 ms	436 KiB

Main

#include <bits/stdc++.h>
#define ll int
#define ld double
#define pb push_back
#define pf push_front
#define ins insert
#define fr first
#define sc second
#define endl "\n"
#define ar array
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()

using namespace std;
void start(){ios_base::sync_with_stdio(NULL);cin.tie(nullptr);cout.tie(nullptr);}

ll N;
double P;
ll t;
vector<bool> ans, cur;

bool check(vector<bool> mask) {
    assert(mask.size() == (size_t)N);

    std::string mask_str(N, ' ');
    for (int i = 0; i < N; i++)
        mask_str[i] = mask[i] ? '1' : '0';

    printf("Q %s\n", mask_str.c_str());
    fflush(stdout);

    char answer;
    scanf(" %c", &answer);
    return answer == 'P';
}

void dnc(ll l, ll r){
    for(ll i=l;i<=r;i++) cur[i] = 1;

    bool f = check(cur);

    for(ll i=l;i<=r;i++) cur[i] = 0;

    if(!check(cur)) return;
    if(l == r) {ans[l] = 1; return;}

    ll m = (l + r) / 2;

    dnc(l, m);
    dnc(m + 1, r);
}

vector<bool> find_positive() {
    ll i;
    ll n = N;
    cur.resize(n);
    ans.resize(n);

    dnc(0, n - 1);

    return ans;
}

int main() {
    start();
    scanf("%d %lf %d", &N, &P, &t);

    for (int i = 0; i < t; i++) {
        std::vector<bool> answer = find_positive();
        assert(answer.size() == (size_t)N);

        std::string answer_str(N, ' ');
        for (int j = 0; j < N; j++)
            answer_str[j] = answer[j] ? '1' : '0';

        printf("A %s\n", answer_str.c_str());
        fflush(stdout);

        char verdict;
        scanf(" %c", &verdict);
        if (verdict == 'W')
            exit(0);
    }

    return 0;
}

/*


*/

Compilation message (stderr)

Main.cpp: In function 'bool check(std::vector<bool>)':
Main.cpp:33:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |     scanf(" %c", &answer);
      |     ~~~~~^~~~~~~~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:66:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |     scanf("%d %lf %d", &N, &P, &t);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:80:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |         scanf(" %c", &verdict);
      |         ~~~~~^~~~~~~~~~~~~~~~~

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