Solutions should compile. Submissions which don't compile are still allowed, but points will be deducted.
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，更多细节参见搜狗输入法下载
For the full proof, let’s look at the generalized
The 11-inch iPad Air starts at $599 (U.S.) for the Wi-Fi model, and $749 (U.S.) for the Wi-Fi + Cellular model. The 13-inch iPad Air starts at $799 (U.S.) for the Wi-Fi model, and $949 (U.S.) for the Wi-Fi + Cellular model.