Created
October 9, 2011 19:03
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| #include <iostream> | |
| using namespace std; | |
| int countOnes (int n) | |
| { | |
| int r = 0; | |
| while (n > 0) { | |
| if (n % 10 == 1) { | |
| r ++; | |
| } | |
| n = n / 10; | |
| } | |
| return r; | |
| } | |
| int main () | |
| { | |
| int sum = 0; | |
| for (int i = 1; i <= 100000000; i++) | |
| { | |
| sum += countOnes (i); | |
| if (sum == i) { | |
| cout << i << endl; | |
| } | |
| } | |
| } | |
| /* | |
| $ time ./count | |
| 1 | |
| 199981 | |
| 199982 | |
| 199983 | |
| 199984 | |
| 199985 | |
| 199986 | |
| 199987 | |
| 199988 | |
| 199989 | |
| 199990 | |
| 200000 | |
| 200001 | |
| 1599981 | |
| 1599982 | |
| 1599983 | |
| 1599984 | |
| 1599985 | |
| 1599986 | |
| 1599987 | |
| 1599988 | |
| 1599989 | |
| 1599990 | |
| 2600000 | |
| 2600001 | |
| 13199998 | |
| 35000000 | |
| 35000001 | |
| 35199981 | |
| 35199982 | |
| 35199983 | |
| 35199984 | |
| 35199985 | |
| 35199986 | |
| 35199987 | |
| 35199988 | |
| 35199989 | |
| 35199990 | |
| 35200000 | |
| 35200001 | |
| real 0m5.942s | |
| user 0m5.936s | |
| sys 0m0.000s | |
| */ |
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