Problem #9

Problem link
Solution:

package main

import "math"

func isSquare(num int) (bool, int) {
    sqrt := int(math.Sqrt(float64(num)))
    if sqrt*sqrt == num {
        return true, sqrt
    }
    return false, -1
}

func main() {
loop:
    for a := 1; a < 500; a++ {
        for b := a; b < 500; b++ {
            result, c := isSquare(a*a + b*b)
            if result && a+b+c == 1000 {
                println(a * b * c)
                break loop
            }
        }
    }
}

Result: 31875000
Time: 0m0.016s