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2180. 统计各位数字之和为偶数的整数个数 ​

为保证权益，题目请参考 2180. 统计各位数字之和为偶数的整数个数(From LeetCode).

解决方案1 ​

CPP ​

C++
class Solution {
 public:
  int countEven(int num) {
    int count = 0;
    for (int n = 1; n <= num; n++) {
      if (this->valid(n)) {
        count += 1;
      }
    }
    return count;
  }

  bool valid(int n) {
    int s = 0;
    while (n != 0) {
      s += n % 10;
      n = n / 10;
    }
    return s % 2 == 0;
  }
};