Submission #743634

#	Time	Username	Problem	Language	Result	Execution time	Memory
743634		rahidilbayramli	Guess the number (BOI20_guess)	C++17	100 / 100	2 ms	256 KiB

Guess

#include<bits/stdc++.h>
#define ll long long
#define ld long double
#define vl vector<ll>
#define vi vector<int>
#define pb push_back
#define all(v) v.begin(), v.end()
#define pii pair<int, int>
#define pll pair<ll, ll>
#define f first
#define s second
using namespace std;
int main()
{
    ll n;
    cin >> n;
    ll l = 1, r = n, ans = -1, mid;
    while(l <= r)
    {
        mid = (l + r) / 2;
        cout << "? " << mid << "\n";
        cout << flush;
        ll s;
        cin >> s;
        if(s == -1)
            l = mid + 1;
        else    if(s == 0)
        {
            cout << "= " << mid;
            cout << flush;
            return 0;
        }
        else
            r = mid - 1;
    }
}

Compilation message (stderr)

Guess.cpp: In function 'int main()':
Guess.cpp:17:22: warning: unused variable 'ans' [-Wunused-variable]
   17 |     ll l = 1, r = n, ans = -1, mid;
      |                      ^~~

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