// 第二步：遍历nums1，从Map中直接查询每个元素的结果（O(1)查询，无需重复计算）
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During the Chávez presidency, Venezuela reclassified its reserves. Previously, there were thought to be just 80 billion barrels of extractable oil, but by 2011, its reported figure had nearly quadrupled. That statistical change was made possible by high oil prices at the time, which allowed previously unviable projects to look feasible.