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AC39vs.user3694931Failed Tests

Write your own sum()

Code
Diff
  • #include <vector>    
#include <numeric>

int sum(std::vector<int>& v) {
   return v.size() == 0   ? -1
          : v.size() == 1 ? v[0]
          : std::accumulate(v.begin(), v.end(), 0);
}
    • #include <vector>
    • #include <numeric>
    • int sum(std::vector<int>& v) {
    • int len = v.size();
    • return len == 0 ? -1
    • : len == 1 ? v[0]
    • return v.size() == 0 ? -1
    • : v.size() == 1 ? v[0]
    • : std::accumulate(v.begin(), v.end(), 0);
    • }