241, 3161: [Example 27.1] Find the sum and mean of integers
Informatics Olympiad - Programming Enlightenment (C++ version) Online Evaluation System
#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
int n,a,c;
double p,s;
cin>>n;
for (int i=1;i<=n;++i)
{
cin>>a;
s+=a;
p=s/n;
}
c=s;
printf("%d %0.5f\n",c,p);
return 0;
}
/*
NOI / 1.5编程基础之循环控制
04求整数的和与均值 2021.11.13 AC
http://noi.openjudge.cn/ch0105/solution/31292749/
*/
#include<iostream>
using namespace std;
int main()
{
int n;
double sum=0,temp;
cin>>n;
for(int i=0;i<n;++i)
{
cin>>temp;
sum+=temp;
}
printf("%.0f %.5f",sum,sum/(double)n);
return 0;
}242, 3162: [Example 27.2] Minimum n value
Informatics Olympiad - Programming Enlightenment (C++ version) Online Evaluation System
243, 3163: [Example 27.3] Number of items
Informatics Olympiad - Programming Enlightenment (C++ version) Online Evaluation System
244, 3164: Practice 27.1 Ding Dang Dang Dang
Informatics Olympiad - Programming Enlightenment (C++ version) Online Evaluation System
#include<iostream>
using namespace std;
int main()
{
int i;
for(i=1;i<21;i++)
{
//' '中有1个空格
cout<<i<<' ';
if(i%2==0) cout<<"叮叮";
if(i%3==0) cout<<"当当";
if(i%2==0||i%3==0) cout<<endl;
}
return 0;
}
/*
作业：
2019：【例4.4】求阶乘
http://ybt.ssoier.cn:8088/problem_show.php?pid=2019
1059：求平均年龄
http://ybt.ssoier.cn:8088/problem_show.php?pid=1059
1060：均值
http://ybt.ssoier.cn:8088/problem_show.php?pid=1060
*/
245, 3165: Practice 27.2 Burnat’s Problem
Informatics Olympiad - Programming Enlightenment (C++ version) Online Evaluation System
/*
试编一程序，求1+2+3+4+5的和。
1+2+3.....1000
1+2+3....100
*/
#include<iostream>
using namespace std;
int main()
{
int i,sum=0;
//i=i+1;
/*
for(i=1;i<=1000;i++)
{
sum+=i;
//sum=sum+i;
}
*/
//高斯的方法
//sum=(1+1000)*1000/2;
sum=(1+5)*5/2;
/*
1+2+.....1000
1+1000 1001
2+999 1001
....
1000/2 *1001
n*(n+1)/2
*/
cout<<"1+2+3+4+5="<<sum<<endl;
return 0;
}
/*
作业：
1061：求整数的和与均值
http://ybt.ssoier.cn:8088/problem_show.php?pid=1061
1062：最高的分数
http://ybt.ssoier.cn:8088/problem_show.php?pid=1062
1063：最大跨度值
http://ybt.ssoier.cn:8088/problem_show.php?pid=1063
*/
246, 940. Han Xin orders troops (Course A)
#include<bits/stdc++.h>
using namespace std;
int main()
{
for(int i=1500;i>=1;i--)
{
if( i%3==2 && i%5==4 && i%7==6 )
{
cout<<i<<endl;
break;
}
}
return 0;
}247, 941. Find the sum of 1+2+3…+N (Course A)
#include<bits/stdc++.h>
using namespace std;
int main()
{
int n;
cin>>n;
cout<<(1+n)*n/2<<endl;
return 0;
}248, 675. Enter multiple ball colors (Magic Academy Lesson 13)
249, 87. Musical Score (Magic Academy Lesson 14)
250. 88. Concentric circles (Magic Academy Lesson 14)
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