const cur = Number(num[i]); // 转数字方便比较（也可直接比较字符）
* @param arr 数组
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The real magic, our Secret Sauce #1, lies in how these border points are selected. Naive approaches quickly fail:
Tributes have been paid to a young British hiker who was among 19 people killed when a packed passenger bus veered off a treacherous stretch of road and plunged 200 metres down a steep mountainside in Nepal.