Submission #1134364

#	Time	Username	Problem	Language	Result	Execution time	Memory
1134364		ReLice	COVID tests (CEOI24_covid)	C++20	10 / 100	4 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;

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';
}

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

    if(t != 1){
        for(i=0;i<n;i++) cur[i] = 1;

        if(!check(cur)) return ans;

        for(i=0;i<n;i++) cur[i] = 0;

        ll L = 0;
        ll R = n - 1;

        cur[R] = 1;
        ans[R] = check(cur);
        cur[R] = 0;

        if(!ans[R]){
            ll l = 0, r = R;
            while(l + 1 < r){
                ll m = (l + r) / 2;

                for(i=m;i<=R;i++) cur[i] = 1;

                if(check(cur)) l = m;
                else r = m;

                for(i=m;i<=R;i++) cur[i] = 0;
            }
            R = l;
        }

        while(L < R){
            while(L < R){
                cur[L] = 1;
                ans[L] = check(cur);
                cur[L] = 0;

                if(ans[L] == 0) break;
                L++;
            }

            ll l = L, r = R;
            while(l + 1 < r){
                ll m = (l + r) / 2;

                for(i=0;i<=m;i++) cur[i] = 1;

                if(check(cur)) r = m;
                else l = m;
            }
            ans[r] = 1;

            L = r + 1;
        }
    }

    else {
        for(i=0;i<n;i++){
            cur[i] = 1;
            ans[i] = check(cur);
            cur[i] = 0;
        }
    }

    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:32:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |     scanf(" %c", &answer);
      |     ~~~~~^~~~~~~~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:108:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  108 |     scanf("%d %lf %d", &N, &P, &t);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:122:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  122 |         scanf(" %c", &verdict);
      |         ~~~~~^~~~~~~~~~~~~~~~~

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