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# 3 Sum

Problem Description

Given an array A of N integers, find three integers in A such that the sum is closest to a given number B. Return the sum of those three integers.

Assume that there will only be one solution.

Problem Constraints
• -3 * 108 <= B <= 3 * 108
• 1 <= N <= 104
• -108 <= A[i] <= 108

Input Format

First argument is an integer array A of size N.

Second argument is an integer B denoting the sum you need to get close to.

Output Format

Return a single integer denoting the sum of three integers which is closest to B.

Example Input

Input 1:

```A = [-1, 2, 1, -4]
B = 1
```

Input 2:

```
A = [1, 2, 3]
B = 6
```

Example Output

Output 1:

```2
```

Output 2:

```6
```

Example Explanation

Explanation 1:

``` The sum that is closest to the target is 2. (-1 + 2 + 1 = 2)
```

Explanation 2:

``` Take all elements to get exactly 6.
```

NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a question? Checkout Sample Codes for more details.
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