Submission #357702

#	Time	Username	Problem	Language	Result	Execution time	Memory
357702		mjhmjh1104	Colors (BOI20_colors)	C++14	22 / 100	5 ms	256 KiB

Colors

#include <cstdio>

int n, t;

int main() {
    scanf("%d", &n);
    int curr = ((n + 1) / 2 - 1) / 2 * 2 + (n % 4 == 0) + 1;
    printf("? %d\n", curr);
    fflush(stdout);
    scanf("%*d");
    for (int i = 2; i < n; i += 2) {
        curr += (i % 4 ? 1 : -1) * i;
        printf("? %d\n", curr);
        fflush(stdout);
        scanf("%d", &t);
        if (t) {
            curr += (i % 4 ? -1 : 1) * (i - 1);
            printf("? %d\n", curr);
            fflush(stdout);
            scanf("%d", &t);
            if (t) printf("= %d\n", i - 1);
            else printf("= %d\n", i);
            fflush(stdout);
            return 0;
        }
    }
    if (n % 2) printf("= %d\n", n);
    else {
        if (curr == 1) curr += n - 1;
        else curr -= n - 1;
        printf("? %d\n", curr);
        fflush(stdout);
        scanf("%d", &t);
        if (t) printf("= %d\n", n - 1);
        else printf("= %d\n", n);
    }
    fflush(stdout);
}

Compilation message (stderr)

Colors.cpp: In function 'int main()':
Colors.cpp:6:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    6 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
Colors.cpp:10:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   10 |     scanf("%*d");
      |     ~~~~~^~~~~~~
Colors.cpp:15:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   15 |         scanf("%d", &t);
      |         ~~~~~^~~~~~~~~~
Colors.cpp:20:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   20 |             scanf("%d", &t);
      |             ~~~~~^~~~~~~~~~
Colors.cpp:33:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   33 |         scanf("%d", &t);
      |         ~~~~~^~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 13 / 13
• Subtask 3: 0 / 21
• Subtask 4: 0 / 24
• Subtask 5: 0 / 33