Shun2439

Keybase proof

I hereby claim:

• I am shun2439 on github.
• I am shun2439 (https://keybase.io/shun2439) on keybase.
• I have a public key ASBl3TWWPRasZA6GtF80mKWOus9fVgKFqsmCd8xHltrwRAo

To claim this, I am signing this object:

Shun2439

#include <iostream>
#include <vector>
using namespace std;

vector<int> a = {1, 14, 32, 51, 51, 51, 243, 419, 750, 910};

// 目的の値 key の index を返すようにする (ない場合は -1)
int binary_search(int key)
{
    int left = 0, right = (int)a.size() - 1; // 配列 a の左端と右端