3185 - 求1-n以内所有奇数的和

<span style="font-family:宋体;font-size:12pt;">【题目描述】</span><span style="font-size:12pt;"></span>

<span style="font-size:12pt;"><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span>&nbsp;</span></span><span style="font-family:宋体;font-size:12pt;">给定一个正整数</span><span style="font-size:12pt;">N</span><span style="font-family:宋体;font-size:12pt;">，输出大于等于</span><span style="font-size:12pt;">1</span><span style="font-family:宋体;font-size:12pt;">且小于等于</span><span style="font-size:12pt;">N</span><span style="font-family:宋体;font-size:12pt;">的所有奇数的和</span><span style="font-size:12pt;"></span>

<span style="font-family:宋体;font-size:12pt;">【输入格式】</span><span style="font-size:12pt;"></span>

<span style="font-size:12pt;"><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span>&nbsp;</span></span><span style="font-family:宋体;font-size:12pt;">一个正整数，即</span><span style="font-size:12pt;">N</span>

<span style="font-family:宋体;font-size:12pt;">【输出格式】</span><span style="font-size:12pt;"></span>

<span style="font-size:12pt;"><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span>&nbsp;</span></span><span style="font-family:宋体;font-size:12pt;">仅包含一行，即答案</span><span style="font-size:12pt;"></span>

<span style="font-family:宋体;font-size:12pt;">【样例输入】</span><span style="font-size:12pt;"></span>

<span style="font-size:12pt;"><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span>&nbsp;</span>10</span>

<span style="font-family:宋体;font-size:12pt;">【样例输出】</span><span style="font-size:12pt;"></span>

<span style="font-size:12pt;">25</span>

<span style="font-family:宋体;font-size:12pt;">【数据规模】</span><span style="font-size:12pt;"></span>

<span style="font-size:12pt;">100%</span><span style="font-family:宋体;font-size:12pt;">的数据，</span><span style="font-family:宋体;font-size:12pt;">n</span><span style="font-family:宋体;font-size:12pt;">≤<span>10000</span></span>

<span style="font-family:宋体;font-size:12pt;">【样例解释】</span><span style="font-size:12pt;"></span>

<span style="font-size:12pt;"><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span>&nbsp;</span>1+3+5+7+9=25</span>

<span style="font-family:宋体;font-size:12pt;"></span>&nbsp;

Input

Output

Examples

Input

Output

Solution C

#include <stdio.h>
int n, i, t;
int main(void) {
    scanf("%d", &n);
    for (i = 1; i <= n; i++) {
        if (i % 2) {
            t += i;
        }
    }
    printf("%d\n", t);
    return 0;
}

Solution C++

#include<iostream>

using namespace std;

int main()
{
	int n,s;
	cin>>n;
	s=0;
	for (int i=1;i<=n;i++)
	{
		if (i%2==1)
		s=s+i;
	}
	cout<<s<<endl;
	return 0;
}

Time Limit	1 second
Memory Limit	128 MB

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