一道题
In this problem, your task is to calculate SUM(n) = 1 + 2 + 3 + ... + n.
Input
The input will consist of a series of integers n, one integer per line.
Output
For each case, output SUM(n) in one line, followed by a blank line. You may assume the result will be in the range of 32-bit signed integer.
Sample Input
1
100
Sample Output
1
5050
输出格式中output SUM(n) in one line是什么意思?
我英语好烂，大侠帮忙
Sum(n)是指哪个？
我这么编可以吗？
main()
{
long a,b;
while (scanf ("%ld %ld",&b,&a)!=EOF)
printf ("%ld\n\n%ld\n",b,(a+b)*(a-b+1)/2);
}
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