제출 #704752

#제출 시각아이디문제언어결과실행 시간메모리
704752pccTrol (COCI19_trol)C++14
50 / 50
1 ms212 KiB
#include <bits/stdc++.h>
using namespace std;

#define ll long long

ll calc(ll t){
    if(t == 0)return 0LL;
    ll k = t%9;
    ll total = 0;
    if(k != 0){
        for(int i = 1;i<=k;i++)total += i;
    }
    return 45LL*(t/9)+total;
}
int main(){
    ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    int q;
    cin>>q;
    while(q--){
        ll a,b;
        cin>>a>>b;
        cout<<calc(b)-calc(a-1)<<'\n';
    }
}
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