Submission #331671

#	Time	Username	Problem	Language	Result	Execution time	Memory
331671		Victor	Guess the number (BOI20_guess)	C++17	100 / 100	69 ms	512 KiB

Guess

#include <bits/stdc++.h>

using namespace std;

#define ii pair<int, int>
#define iii pair<int, ii>
#define vi vector<int>
#define vii vector<ii>
#define ll long long
#define INF 1000000000

int main()
{
    int low = 1, high, response;
    scanf("%d", &high);
    do 
    {
        int middle = (high + low) / 2;
        printf("? %d\n", middle);
        fflush(NULL);
        scanf("%d", &response);
        if (response > 0) high = middle - 1;
        else if (response < 0) low = middle + 1;
    } while (response);
    printf("= %d\n", (high + low) / 2);
    return 0;
}

Compilation message (stderr)

Guess.cpp: In function 'int main()':
Guess.cpp:15:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   15 |     scanf("%d", &high);
      |     ~~~~~^~~~~~~~~~~~~
Guess.cpp:21:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   21 |         scanf("%d", &response);
      |         ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 29 / 29
• Subtask 2: 71 / 71