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result.push(output.slice()); 为什么这里不能直接push output? 我自己在写的时候遇到这个问题,直接push进去会是一个空数组? 但是打印出来却是有值的 output不就是一个数组吗,为什么还需要特殊处理呢?
result.push(output.slice());