（三）扬言实施放火、爆炸、投放危险物质等危害公共安全犯罪行为扰乱公共秩序的。
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思路：单调递增栈 + k 控制删除次数。高位越小整体越小，遇更小数字时弹出栈顶大数（仅当 k0）；栈空且当前为 0 则跳过（避免前导零）；若遍历完 k 仍0，从末尾再删 k 位。
Pokémon Trading Card Game: 30th anniversaryWhile details were sparse, the Pokémon event announced that the Pokémon Trading Card Game will also be celebrating Pokémon's 30th anniversary.