Submission #1036027

#	Time	Username	Problem	Language	Result	Execution time	Memory
1036027		sleepntsheep	COVID tests (CEOI24_covid)	C11	10 / 100	3437 ms	344 KiB

Main

#include <stdio.h>
#include <string.h>

int n, t;
double p;

char ask(char *q) {
    char result;
    printf("Q %s\n", q);
    fflush(stdout);
    scanf(" %c", &result);
    return result;
}

int main() {
    scanf("%d%lf%d", &n, &p, &t);

    if (t == 1) {
        char a[1001] = { 0 };
        for (int i = 0; i < n; ++i) {
            char q[1001] = { 0 };
            for (int j = 0; j < n; ++j)
                q[j] = '0' + (j == i);
            a[i] = (ask(q) == 'P') + '0';
        }
        printf("A %s\n", a);
        return 0;
    }

    int x = n / p;

    while (t--) {
        char a[1001] = { 0 };
        for (int i = 0; i < n; ++i)
            a[i] = '0';
        int at = 0;
        while (at < n) {
            char q[1001] = { 0 };
            for (int i = 0; i < n; ++i)
                q[i] = '0';
            for (int i = at; i < at + x && i < n; ++i)
                q[i] = '1';
            if (ask(q) == 'N') {
                at += x;
                continue;
            }

            int lb = at - 1, ub = n;
            while (ub - lb > 1) {
                int md = lb + (ub - lb) / 2;

                for (int i = 0; i < n; ++i)
                    q[i] = '0';
                for (int i = at; i <= md; ++i)
                    q[i] = '1';

                if (ask(q) == 'P') ub = md;
                else lb = md;
            }

            if (ub < n)
                a[ub] = '1';
            at = ub + 1;
        }

        printf("A %s\n", a);
        fflush(stdout);
        char verdict;
        scanf(" %c", &verdict);
        if ('W' == verdict)
            return 0;
    }
}

Compilation message (stderr)

Main.c: In function 'ask':
Main.c:11:5: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |     scanf(" %c", &result);
      |     ^~~~~~~~~~~~~~~~~~~~~
Main.c: In function 'main':
Main.c:16:5: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     scanf("%d%lf%d", &n, &p, &t);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.c:69:9: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |         scanf(" %c", &verdict);
      |         ^~~~~~~~~~~~~~~~~~~~~~

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