leetcode 233. Number of Digit One
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leetcode 233. Number of Digit One
问题分解: 分治进行计算的思想
public class Solution { public int countDigitOne(int n) { if(n<=0) return 0; int r = 0; for(long m=1;m<=n;m=m*10){ r += (n/m+8)/10*m + (n/m%10==1?n%m+1:0); } return r; }}
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