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问答题
In writing all of the integers from 1 to 300, how many times is the digit 1 used?
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解析：
可以参考TACTIC8。根据题意，把数位上有1的数值进行系统地列举有：1到99之间，数位上有1的共20个数值，即(1，11，21…，91)和(10，11，2…，19)；相应地，200到299之间，数位上有1的也有20个数值；而100到199之间，数位上有1的除了个位，十位上的，还有百位上的，共有120个数值，所以总数是20+20+20+100=160.
可以参考TACTIC8。根据题意，把数位上有1的数值进行系统地列举有：1到99之间，数位上有1的共20个数值，即(1，11，21…，91)和(10，11，2…，19)；相应地，200到299之间，数位上有1的也有20个数值；而100到199之间，数位上有1的除了个位，十位上的，还有百位上的，共有120个数值，所以总数是20+20+20+100=160.
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