// ⚠️ 易错点4：循环条件写right = 0（会导致right-1越界），或把<=写成<（漏判相等的有序情况）
Kyiv’s willingness to send its specialists abroad marks a significant strategic sacrifice because of the impact on Ukraine’s own air defense capabilities. With the constant barrage of drones from Russia, every trained soldier is a vital asset.
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We are also tracking the parent of the stack frame, which is the stack frame that called it. This is for mechanical reasons that will be explained later.
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