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#include<iostream>
#include<algorithm>
#include<sstream>
#include<fstream>
#include<utility>
#include<cstdlib>
#include<cstring>
#include<string>
#include<bitset>
#include<vector>
#include<cstdio>
#include<cctype>
#include<cmath>
#include<queue>
#include<deque>
#include<stack>
#include<map>
#define ll long long
#define sc scanf
#define pf printf
#define pi 2*acos(0.0)
using namespace std;
int main()
{
int t,k=1;
cin>>t;
while(t--)
{
int n,a,b,d=0;
vector<int>v;
vector<int>v1;
cin>>n;
for(int i=0;i<n;i++)
{
cin>>a;
cin>>b;
v.push_back(a+b);
}
for(int i=n-1,j=0;i>=0;i--)
{
if(v[i]>=10)
{
v1.push_back(v[i]%10);
d=v[i]/10;
v[i-1]=v[i-1]+d;
d=0;
}
else
v1.push_back(v[i]);
}
if(d!=0)
v1.push_back(d);
for(int i=v1.size()-1;i>=0;i--)
cout<<""<<v1[i];
if(t)
pf("\n\n");
else
pf("\n");
}
return 0;
}
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