《信息学奥赛一本通 编程启蒙C++版》3231-3235（5题）

#include <bits/stdc++.h>
using namespace std;
int main()
{
	int n;
	cin>>n;
	for(int i=1;i<n;i++){
		for(int j=1;j<i;j++) cout<<" ";
		cout<<"*";
		for(int j=1;j<2*(n-i);j++) cout<<" ";
		cout<<"*"<<endl;
	}
	for(int i=1;i<=n;i++){
		for(int j=1;j<n;j++) cout<<" ";
		cout<<"*"<<endl;
	}
	return 0;
}

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#include<bits/stdc++.h>
using namespace std;
int main()
{
	int ans;
	cin>>ans;
	int num=ans,sum=ans;
	bool abc=false;
	
	for(int i=1;i<=ans*2-1;i++)
	{
		for(int j=1;j<=ans*2-1;j++)
		{
			if( j==num || j==sum )
			{
				cout<<'*';
			}
			else
			{
				cout<<' ';
			}
		}
		
		cout<<endl;
		
		if( i!=ans && abc==false )
		{
			num++;
			sum--;
		}
		else
		{
			abc=true;
			num--;
			sum++;
		}
	}
	
    return 0;
}

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#include<bits/stdc++.h>
using namespace std;
int main()
{
	int ans;
	cin>>ans;
	int num=ans,sum=ans+1;
	
	for(int i=1;i<=ans;i++)
	{
		for(int j=1;j<=ans*2;j++)
		{
			if( j==num )
			{
				cout<<"/";
			}
			else
			{
				if( j==sum )
				{
					cout<<"\\";
				}
				else
				{
					if( j>=num && j<=sum )
					{
						cout<<"_";
					}
					else
					{
						cout<<" ";
					}
				}
			}
		}
		
		cout<<endl;
		
		num--;
		sum++;
	}
	
    return 0;
}

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#include <bits/stdc++.h>
using namespace std;
int main()
{
	long long n,k;
	cin>>n>>k;
	cout<<n/k;
	return 0;
}

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#include <bits/stdc++.h>
using namespace std;
int main()
{
	double h,a;
	cin>>h;
	for(int i=1;i<=10;i++){
		a+=h;
		h/=2;
		a+=h;
	}
	a-=h;
	cout<<a<<endl<<h;
	return 0;
}

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