Couple to re-start trek around Britain's coastline
k--; // 剩余删除名额减1（关键：控制删除位数，保证保留足够长度）
。快连下载-Letsvpn下载对此有专业解读
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When Chávez became Venezuela's president in 1999, oil prices were climbing. In the early 2010s, a barrel would often fetch about $100, providing the government with plenty of money to pour into social programmes. But with current prices around the $65 mark, the country looks less like a reasonable investment.
* @param {string} num 非负整数的字符串形式（可能含前导零）