2630. Alternating Digit Sum
My accepted C++ solution to LeetCode problem 2630, Alternating Digit Sum, running in 0ms.
- Difficulty: Easy
- C++
- Runtime 0ms
- Memory 7.9MB
- Updated
Read the problem on LeetCode View on GitHub
The problem statement is LeetCode’s and stays on their site. What follows is my accepted solution.
C++
Accepted on LeetCode — runtime 0ms, memory 7.9MB, accepted 2025-12-27.
class Solution {
public:
int alternateDigitSum(int n) {
string s = to_string(n);
int sum = 0, sign = 1;
for (char c : s) {
sum += sign * (c - '0');
sign = -sign;
}
return sum;
}
};