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()
{IOSint 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;
}