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| #include<bits/stdc++.h>
#include<algorithm>
#define rep(i,a,n) for(int i=a;i<n;++i)
#define per(i,a,n) for(int i=n-a;i>=a;--i)
#define fi first
#define se second
#define cl(x,a) memset(x,a,sizeof(x))
#define all(x) x.begin(),x.end()
#define INF 0x3f3f3f3f
#define EPS 1e-9
#define mod 1000000007
using namespace std;
const int maxn=1e5+5;
const int maxm=1e5+5;
typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> vi;
typedef pair<int,int> pii;
int t,n,m;
int main(){
ios::sync_with_stdio(false);
cin>>t;
while(t--){
cin>>n;
ll ans=0;
rep(i,0,n){
int a,b;
cin>>a>>b;
ans+=a*b;
}
cout<<ans<<endl;
}
}
|