PPT 的好坏见仁见智，我仅从能否在工作场景下使用来主观评判；
if (n <= 1) return 0;
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Film type: Kodak Instant Print 3 x 3-inch cartridge (included) / Film size: 3 x 3-inch square prints / Weight: 467 grams / Charging method: Micro USB / Companion app: Yes / Other features: LCD screen, smartphone printing