Submission #1058476

#	Time	Username	Problem	Language	Result	Execution time	Memory
1058476		rainboy	COVID tests (CEOI24_covid)	C11	56.60 / 100	1223 ms	596 KiB

Main

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

#define N	1000

int min(int a, int b) { return a < b ? a : b; }

int n, m; double p;

int query(int l, int r) {
	static char cc[N + 1], s[2];

	memset(cc, '0', n * sizeof *cc), memset(cc + l, '1', (r - l) * sizeof *cc), cc[n] = 0;
	printf("Q %s\n", cc), fflush(stdout);
	scanf("%s", s);
	return s[0] == 'P';
}

char cc[N + 1]; int b;

int solve(int l, int r, int has) {
	int m;

	if (!has && !query(l, r)) {
		memset(cc + l, '0', (r - l) * sizeof *cc);
		return 0;
	}
	if (r - l > 1) {
		m = (l + r) / 2;
		solve(m, r, !solve(l, m, 0));
	}
	return 1;
}

int main() {
	int t;

	scanf("%d%lf%d", &n, &p, &t), m = 1 / p;
	while (t--) {
		int l;

		memset(cc, '1', n * sizeof *cc), cc[n] = 0;
		for (l = 0; l < n; l += m)
			solve(l, min(l + m, n), 0);
		printf("A %s\n", cc), fflush(stdout);
		scanf("%*s");
	}
	return 0;
}

Compilation message (stderr)

Main.c: In function 'query':
Main.c:15:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |  scanf("%s", s);
      |  ^~~~~~~~~~~~~~
Main.c: In function 'main':
Main.c:38:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |  scanf("%d%lf%d", &n, &p, &t), m = 1 / p;
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.c:46:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |   scanf("%*s");
      |   ^~~~~~~~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 0 / 10
• Subtask 2: 56.600000001000005 / 90