1
/**
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 * @param {number[]} nums
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 * @return {number[]}
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 */
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var runningSum = function (nums) {
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  let res = [];
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  let a = 0;
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  for (let i = 0; i < nums.length; i++) {
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    res[i] = a + nums[i];
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    a = res[i];
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    if (res.length < nums.length) {
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      res.push(a);
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    }
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  }
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  return res;
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};