Find the index of two numbers in an array that equal a target sum

Question

Find the index of two numbers in an array that equal a target sum

[https://drive.google.com/file/d/12qIWazKzBr1yJGpo1z106euXVJMKMwEa/view?usp=sharing][1]I am struggling to find the correct indices of two numbers in an array whose sum equals a target number provided as an argument. I attempted to solve this using a for loop, but my code is not returning the accurate indices. For example, if the first two numbers in the array are both 1 and the target is set as 2, I am getting the answer as [0,0], however, I want it to be [0,1]

let arr = [1,1,8,9,7,22,6]

var twoSum = function(nums, target) {
    for(i=0;i<nums.length;i++){
        for(j=i+1;j<nums.length;j++)
        if(nums[i] + nums[j]==target){
           
            return [nums.indexOf(nums[i]) , nums.indexOf(nums[j])]
        }

    }
};
console.log(twoSum(arr, 2))
i am expecting output as [0,1]
but i am getting output as [0,0]


  [1]: https://i.sstatic.net/n1jo7.png

javascript arrays loops

Answer 1

Answer №1

Modifications:- Alter the output statement in your code

Script:-

let arr = [1,1,8,9,7,22,6]
var twoSum = function(nums, target) {
    for(i=0;i<nums.length;i++){
        for(j=i+1;j<nums.length;j++)
        if(nums[i] + nums[j]==target){
            return [i,j]
        }

    }
};
console.log(twoSum(arr, 2))

Result:-

node /tmp/fiXkoJ2VkT.js
[ 0, 1 ]

Note that if you are aiming for a total of 9, [0,2] and [1,2] both combinations result in 9 but only [0,2] will be displayed instead of [1,2]. This is because the algorithm checks the first element in all possible pairs before moving onto the second element.

Revised segment .. {your question}

https://i.sstatic.net/ZzR5o.png

Answer 2

Modifications:- Alter the output statement in your code

Script:-

let arr = [1,1,8,9,7,22,6]
var twoSum = function(nums, target) {
    for(i=0;i<nums.length;i++){
        for(j=i+1;j<nums.length;j++)
        if(nums[i] + nums[j]==target){
            return [i,j]
        }

    }
};
console.log(twoSum(arr, 2))

Result:-

node /tmp/fiXkoJ2VkT.js
[ 0, 1 ]

Note that if you are aiming for a total of 9, [0,2] and [1,2] both combinations result in 9 but only [0,2] will be displayed instead of [1,2]. This is because the algorithm checks the first element in all possible pairs before moving onto the second element.

Revised segment .. {your question}

https://i.sstatic.net/ZzR5o.png

Answer 3

Answer №2

The method known as indexOf is utilized to identify the initial appearance of a specific value within an array. In the event that both index 0 and index 1 contain the value 1, the method will solely indicate the position of 0 since it signifies the first occurrence of 1.

Check out the MDN Documentation

Solely retrieve the values of i and j themselves.

return [i, j];

Answer 4

The method known as indexOf is utilized to identify the initial appearance of a specific value within an array. In the event that both index 0 and index 1 contain the value 1, the method will solely indicate the position of 0 since it signifies the first occurrence of 1.

Check out the MDN Documentation

Solely retrieve the values of i and j themselves.

return [i, j];

Answer 5

Answer №3

let numbers = [1, 1, 8, 9, 7, 22, 6];

function findTwoSum(numbers, targetValue) {
  for (let i = 0; i < numbers.length; i++) {
    for (let j = i + 1; j < numbers.length; j++) {
      if (numbers[i] + numbers[j] === targetValue) console.log([i, j]);
    }
  }
}

findTwoSum(numbers, 2);

Answer 6

let numbers = [1, 1, 8, 9, 7, 22, 6];

function findTwoSum(numbers, targetValue) {
  for (let i = 0; i < numbers.length; i++) {
    for (let j = i + 1; j < numbers.length; j++) {
      if (numbers[i] + numbers[j] === targetValue) console.log([i, j]);
    }
  }
}

findTwoSum(numbers, 2);

Find the index of two numbers in an array that equal a target sum

Answer №1

Answer №2

Answer №3

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