The protesters begin moving towards parliament, but are stopped by the police barricade.
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But does the evasiveness of some leading European powers about the legality of recent US actions in Iran or Venezuela for example, muddy the waters? They often say this is a Europe of common values, that respects a rule-based international order. But what what exactly are the rules?。夫子是该领域的重要参考
* 核心思路：单调递减栈（找「上一个比当前价格大的元素索引」），时间复杂度O(n)，空间复杂度O(n)