time limit exceeded!!为什么？？？

[chuchuzinnia]

#include<stdio.h>
int main(){
    int i,n,a[2];
    for(i=0;i<2;i++)
    {
        scanf("%d",&n);
        a[i]=(1+n)*n/2;
    }
    for(i=0;i<2;i++)
    {
        printf("%d\n\n",a[i]);
    }
    return 0;
}

怎么会time limit exceeded呢？？

[chuchuzinnia]

自己顶下！！

[xkyx_cn]

题目?
条件?

[K行天下]

我运行一次没有错误啊。Dev C++

[chuchuzinnia]

Problem Description
Hey, welcome to HDOJ(Hangzhou Dianzi University Online Judge).

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

[fangfei_119]

VC运行没有问题.a[i]在int范围运行正常.
ORA-00040: active time limit exceeded - call aborted
Cause: The Resource Manager SWITCH_TIME limit was exceeded.
Action: Reduce the complexity of the update or query, or contact your database administrator for more information.
ORA-00041: active time limit exceeded - session terminated
Cause: The Resource Manager SWITCH_TIME limit was exceeded.
Action: Reduce the complexity of the update or query, or contact your database administrator for more information.

[chuchuzinnia]

怎么看不到回复啊？郁闷！！！

[chuchuzinnia]

我发现杭电的ACM的网站有问题，提交的结果即使正确都会有这样那样的毛病！

[SammyLan]

楼主没有学过等差数列么..........
一看就超时了(=_=)

[chuchuzinnia]

你说说看那，为什么一看就超时了？我怎么不知道！

[SammyLan]

时间复杂度为O(1)的算法给你写成O(N)了,能不超时么

[chuchuzinnia]

怎么页面刷新了也看不到回复啊？

[lionc650]

lz很逗.....为何还用for循环呢...

[chuchuzinnia]

那应该怎么写呢？

[chuchuzinnia]

这是题目要求的呀！

[chuchuzinnia]

#include<stdio.h>
int main(){
    int n,m;
    scanf("%d %d",&n,&m);
    printf("%d\n\n%d\n",(1+n)*n/2,(1+m)*m/2);
    return 0;
}

这样也不对啊，结果是wrong answer！

[xkyx_cn]

这个代码是Accepted的, 你对比一下

#include <stdio.h>

int main()
{
	unsigned int a, sum;
	while (EOF != scanf("%u", &a))
	{
		sum = 0;
		sum = (a + 1) * a / 2;
			
		printf("%d\n\n", sum);
	}

	return 0;
}

[hedoudou]

我gcc编译，linux下面没有问题

[chuchuzinnia]

11

[chuchuzinnia]

明白了，谢谢！