Envío 3557

Código

const readline = require('readline');
const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout
});

let lineCounter = 0;
let subTotalsArray;

function sumSubTotals(initialArray) {
  let currentSum = 0
  let sumsArray = []
  
  for(item of initialArray) {
    currentSum = item + currentSum;
    sumsArray.push(currentSum);
  }

  return sumsArray
}

const sumSubArray = (fromIndex, toIndex) => {
  if (fromIndex === 0) return subTotalsArray[toIndex]
  return subTotalsArray[toIndex] - subTotalsArray[fromIndex - 1];
}

rl.on("line", (line) => {
 ++lineCounter;
 if (lineCounter === 2) {
  // Run the initial algorithm
  const initialArray = line.split(" ").map(Number);
  subTotalsArray = sumSubTotals(initialArray)
 }

 if (lineCounter > 3) {
   // these are the inputs Q & P
   const [Q, P] = line.split(" ").map(Number);
   console.log(sumSubArray(Q, P))
 }
})