連續整數的固定和

public class Test {

    public static void main(String[] args) {
        int left, right;
        int sum;
        //int given = Integer.parseInt(args[0]);
        int given = 27;//指定的數
        int count = 0;
        for (sum = 0  ,right=1; sum < given; sum += right, right++) {
        }

        for(left = 1,right--;left<=given/2;){
            if(sum>given)
                sum-=(left++);
            else{
                if(sum==given){
                    System.out.println(given+"= sum from "+left+" to "+ right);
                    count++;
                }
                sum+=(++right);
            }
        }
        if(count>0){
            System.out.println("一共有"+count+"解");
        }
        else{
            System.out.println("無解");
        }
    }
}