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Nepal is a young democracy. It became a republic in 2008, after a civil war that killed more than 17,000 people and lasted 10 years.
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swap(&arr[0], &arr[i]); // 堆顶(最大)换到末尾
为应对客流高峰，铁路部门在京广、京沪、沪昆、京哈等主要高铁干线单日安排开行夜间高铁列车超 1000 列，并在热门方向增开临时旅客列车，单日最高增开 2314 列。