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This is a snippet from this code to finding sums of all subarrays of a given array, but this doesn't work as intended as the problem seems to be lying with pre-incrementing value of i in the equation.

while(i<vec.size()-1){
  sum += -vec[i-2] + vec[++i] ;
  nums.emplace_back(sum);
}
return nums;

However, when i deploy this code which seems to be the same implementation as the previous one, the code runs correctly:

while(i<vec.size()-1){
  sum += -vec[i-2] + vec[i+1] ;
  nums.emplace_back(sum);
  i++;
}

Please Clarify!

I tried it on: (1,2,3,4,) Expected: 6,9,12 Output from 1st snippet: 6,8,10 //Incorrect Output from 2nd snippet: 6,9,12 //Correct

Improve this question
3
  • 1
    Share the data format of the arrays... and What language are you using? Commented Nov 26, 2023 at 7:22
  • Why does your expected output only have 3 values? An array of 4 elements has 10 subarrays ... And how would you get a sum of 12, when all elements in the array only sum up to 10? Commented Nov 26, 2023 at 14:08
  • The code is written in C++. The data format: vector<int> (if thats what you asked) And sorry the input array is: 1,2,3,4,5 and not 1,2,3,4, (mistake on my part, its my first question ever :_) ) Thanks for your response.. Commented Nov 26, 2023 at 18:16
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