diff options
Diffstat (limited to 'other/happy_number.cpp')
-rw-r--r-- | other/happy_number.cpp | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/other/happy_number.cpp b/other/happy_number.cpp new file mode 100644 index 0000000..e946b96 --- /dev/null +++ b/other/happy_number.cpp @@ -0,0 +1,37 @@ +#include "leetcode.h" + +class Solution { +public: + bool isHappy(int n) { + int slow, fast; + slow = fast = n; + do { + slow = square(slow); + for (int i = 0; i < 2; i++) + fast = square(fast); + } while (slow != fast); + if (slow == 1) + return 1; + else + return 0; + } + +private: + int square(int n) { + int num = 0, tmp; + while (n) { + tmp = n % 10; + num += tmp * tmp; + n /= 10; + } + return num; + } +}; + +int main() { + Solution obj; + if (obj.isHappy(19)) + cout << "true"; + else + cout << "false"; +} |