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<h2 id="374-Guess-Number-Higher-or-Lower（猜数字大小）"><a href="#374-Guess-Number-Higher-or-Lower（猜数字大小）" class="headerlink" title="374. Guess Number Higher or Lower（猜数字大小）"></a>374. Guess Number Higher or Lower（猜数字大小）</h2><h3 id="链接"><a href="#链接" class="headerlink" title="链接"></a>链接</h3><p><a href="https://leetcode-cn.com/problems/guess-number-higher-or-lower" target="_blank" rel="noopener">https://leetcode-cn.com/problems/guess-number-higher-or-lower</a></p>
<h3 id="题目"><a href="#题目" class="headerlink" title="题目"></a>题目</h3><p>我们正在玩一个猜数字游戏。 游戏规则如下：<br>我从 1 到 n 选择一个数字。 你需要猜我选择了哪个数字。<br>每次你猜错了，我会告诉你这个数字是大了还是小了。<br>你调用一个预先定义好的接口 guess(int num)，它会返回 3 个可能的结果（-1，1 或 0）：</p>
<p>-1 : 我的数字比较小<br> 1 : 我的数字比较大<br> 0 : 恭喜！你猜对了！<br>示例 :</p>
<p> 输入: n = 10, pick = 6<br> 输出: 6</p>
<h3 id="思路"><a href="#思路" class="headerlink" title="思路"></a>思路</h3><p>这个也是二分查找，只不过又换了一种问法。<br>这里只需要注意到leftright的更新与guess函数的返回值即可。</p>
<h3 id="代码"><a href="#代码" class="headerlink" title="代码"></a>代码</h3><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line">public static int guessNumber(int n) {</span><br><span class="line"> int left = 1;</span><br><span class="line"> int right = n;</span><br><span class="line"></span><br><span class="line"> while (left <= right) {</span><br><span class="line"> int mid = left + (right - left) / 2;</span><br><span class="line"> if (guess(mid) == 0) {</span><br><span class="line"> return mid;</span><br><span class="line"> } else if (guess(mid) == 1) {</span><br><span class="line"> left = mid + 1;</span><br><span class="line"> } else if (guess(mid) == -1) {</span><br><span class="line"> right = mid - 1;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> return 0;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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