[leetcode] Happy Number
Happy Number
Write an algorithm to determine if a number is "happy".
A happy number is a number defined by the following process: Starting with any positive integer, replace the number by the sum of the squares of its digits, and repeat the process until the number equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1. Those numbers for which this process ends in 1 are happy numbers.
Example: 19 is a happy number
- 12 + 92 = 82
- 82 + 22 = 68
- 62 + 82 = 100
- 12 + 02 + 02 = 1
const int SIZE = 1000; class Solution { private: bool isExist(int n) { for(int i=0; i<SIZE; i++) if(A[i] == n) return true; return false; } public: bool isHappy(int n) { int m = 0, index = 0; while(1 != n) { m = 0; while(n) { m += pow(n%10, 2); n /= 10; } n = m; if(isExist(n)) return false; A[index++] = n; } return true; } private: int A[SIZE]; };
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