#include <bits/stdc++.h> using namespace std; #pragma GCC optimize("O3,unroll-loops") #define int long long #define ii pair<int,int> #define fir first #define sec second #define pb push_back signed main(){ ios_base::sync_with_stdio(0); cin.tie(0);cout.tie(0); int tc; cin>>tc; while(tc--){ int l,r; cin>>l>>r; int brp=(r-l+1)/9; int sisa=(r-l+1)-brp*9; int ans=brp*45; int cur=l%9; for(int q=1;q<=sisa;q++){ if(cur==0)cur=9; ans+=cur; cur++; cur%=9; } cout<<ans<<endl; } }