时间限制: 2s
内存限制: 192MB 提交: 1346 解决: 1040
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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