算法2
(暴力枚举) $O(n^2)$
java 代码
n=Scanf_Int();
m=Scanf_Int();
if (m==n){
out.println(0);
out.close();
System.exit(0);
}
m1=Math.abs(n-m);
while (m1!=0){
if (m1>0){
l++;
m1--;
sum+=l;
}
if (m1>0){
r++;
m1--;
sum+=r;
}
}
out.println(sum);