codeforces--707C. Pythagorean Triples

cf 707C

题解

Wikipedia：勾股数
勾股数的一种构造方法:
若 a=2n+1，则 b=2n2+2n，c=b+1；
若 a=2n，则 b=n2−1，c=n2+1

import java.util.Scanner;public class CF707C {    public static void main(String[] args) {            Scanner cin = new Scanner(System.in);        long n = cin.nextLong();        if(n <= 2){            System.out.println(-1);            return;        }        if((n & 1) == 1){            n /= 2;            long m = 2 * n * (n + 1);            long k = m + 1;            System.out.println(m + " " + k);        }        else{            n /= 2;            long m = n * n - 1;            long k = n * n + 1;            System.out.println(m + " " + k);        }    }}