``@receiver isNil ifTrue: ``@nilBlock -> ``@receiver ifNil: ``@nilBlockOr maybe with single backticks?
实际题目往往需要先做一步转化（如循环数组、链表转数组、先排序再栈），再套上面模板即可。
。业内人士推荐搜狗输入法2026作为进阶阅读
People across region are bracing for possibility of conflict as embassies evacuate staff and flights are cancelled
"satisfiable": true,