#include<bits/stdc++.h> using namespace std; int main() { int x; cin>>x; while(x!=0) { cout<<endl; long long a,b,c; cin>>a>>b>>c; if(b%3==0) {

long long q;
		if((b%3+c%3)%3!=3&&(b%3+c%3)%3!=0)
		{
			q=a+(b+c)/3+1;
		}
		else
		{
			q=a+(b+c)/3;
		}
		cout<<q<<endl;
		
	}
	else
	{
		if(c<3-b%3&&c!=0)
		{
				cout<<"-1";
		}
		else
		{
			long long q;
			if((b%3+c%3)%3!=3&&(b%3+c%3)%3!=0)
			{
				q=a+(b+c)/3+1;
			}
			else
			{
				q=a+(b+c)/3;
			}
			cout<<q<<endl;
		}
	}
	x--; 
}

}

using namespace std;
int t;
int main()
{
	cin >> t;
	while(t--)
	{
		long long a=0,b=0,c=0,abc=0;
		cin >> a >> b >> c;
		abc+=a;
		abc+= b/3;
		if(b%3!=0)
		{
			if((3-b%3) > c)
			{
				cout << -1 << endl;
				continue; 
			}
			c -= (3-b%3);
			abc++;
		}
		abc+= c/3;
		if(c%3!=0)
		{
			abc++;
		}
		cout << abc << endl;
	}
}

#include<iostream>
using namespace std;
long long a[10];
long long b[100000];
int main()
{
    long long t;
    cin>>t;
    for(int i=1;i<=t;i++)
    {
        int c=1;
        while(c<=3)
        {
            cin>>a[c];
            c++;
        }
        if((a[2]%3)+a[3]<3&&(a[2]%3)!=0)
        {
            b[i]=-1;
        }
        else{
            if((a[2]+a[3])%3!=0)
                b[i]=a[1]+(a[2]+a[3])/3+1;
            else{
                b[i]=a[1]+(a[2]+a[3])/3;
            }
        }
    }
    for(int i=1;i<=t;i++)
    {
        cout<<b[i]<<endl;
    }
}

辛雨的题解来了! 屎山迷宫YYDS

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
ll cmp[100001];
int main(){
    int t;
    cin >>t;
    int tmp = 0;
    for(int i = 0;i<t;i++){
        ll a,b,c;
        cin >>a>>b>>c;
        cmp[i] = a;
        if(b % 3 >= c&&b != 0&&c != 0){
            cmp[i] = -1;
        }
        else if(b % 3 == 0){
            cmp[i] += b / 3;
            if (c % 3 == 0){
                cmp[i] += c / 3;
            }
            else{
                cmp[i] += c / 3 + 1;
            }
        }
        else if(b % 3 == 1){
            if(c - 2 >= 0){
                cmp[i] += b / 3 + 1;
                c-=2;
                if (c % 3 == 0){
                    cmp[i] += c / 3;
                }
                else{
                    cmp[i] += c / 3 + 1;
                }
            }
            else{
                cmp[i] = -1;
                tmp++;
                break;
            }
        }
        else if(b % 3 == 2){
            if(c - 1 >= 0){
                cmp[i] += b / 3 + 1;
                c--;
                if (c % 3 == 0){
                    cmp[i] += c / 3;
                }
                else{
                    cmp[i] += c / 3 + 1;
                }
            }
            else{
                cmp[i] = -1;
                tmp++;
                break;
            }
        }
        tmp++;
    }
    for (int i = 0;i<tmp;i++){
        cout <<cmp[i]<<endl;
    }
}