cf练习5.29

A

ac代码

#include<bits/stdc++.h>
#define IOS ios::sync_with_stdio(false),cin.tie(0),cout.tie(0);

using namespace std;

int main()
{
	IOS
	int t;
	cin>>t;
	while(t--)
	{
		int ans=0;
		int a,b;
		cin>>a>>b;
		if(b==0)
		{
			if(a%15==0) ans=a/15;
			else ans=a/15+1;
		}

		else if(b!=0 && b%2==0)
		{
			if(a<=b/2*7) ans=b/2;
			else{
				if((a-(b/2*7))%15==0) ans=b/2+((a-b/2*7)/15);
				else ans=b/2+((a-b/2*7)/15)+1;
			}
			//cout<<ans<<endl;
		}
		
		else if(b%2==1)
		{
			if(a<=(b/2*7+11)) ans=b/2+1;
			else {
				if((a-b/2*7-11)%15==0) ans=b/2+1+(a-b/2*7-11)/15;
				else ans=b/2+1+(a-b/2*7-11)/15+1;
			}
		}
		cout<<ans<<endl;
	}
	
	return 0;
}