* 时间复杂度: O(n²) 最好: O(n) 空间复杂度: O(1) 稳定: ✓
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* 核心思路：单调递增栈 + 控制删除位数（k0），优先移除高位大数，保证剩余数字最小
（二）具有网络虚拟定位功能的；