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// Sum digits in vector
int digit_sum(vector<int> num) {
int sum = 0;
for (auto x : num) sum += x;
return sum;
}
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#include <numeric>
sum_of_elems = std::accumulate(vector.begin(), vector.end(), 0);
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#include <numeric>
sum_of_elems = std::accumulate(vector.begin(), vector.end(), 0);