时间限制: 2s
内存限制: 192MB 提交: 1356 解决: 1044
题目描述
输入正整数n，判断从1到n之中，数字1一共要出现几次。例如1123这个数，则出现了两次1。例如15，那么从1到15之中，一共出现了8个1。
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