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author | jack <[email protected]> | 2024-06-14 13:13:15 -0600 |
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committer | jack <[email protected]> | 2024-06-14 13:13:15 -0600 |
commit | d343a3b18dbaca9297d4f7b2280c4a16f0a5c8aa (patch) | |
tree | 96df922dae2a5073d9a50ea70c7aae6aa37e3ebe /happy_number.cpp | |
download | leetcode-d343a3b18dbaca9297d4f7b2280c4a16f0a5c8aa.tar.gz leetcode-d343a3b18dbaca9297d4f7b2280c4a16f0a5c8aa.zip |
initial
Diffstat (limited to 'happy_number.cpp')
-rw-r--r-- | happy_number.cpp | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/happy_number.cpp b/happy_number.cpp new file mode 100644 index 0000000..e946b96 --- /dev/null +++ b/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"; +} |