Submission #205605

#	Time	Username	Problem	Language	Result	Execution time	Memory
205605		mayhoubsaleh	Trol (COCI19_trol)	C++14	50 / 50	6 ms	376 KiB

trol

#include <bits/stdc++.h>
#define pb push_back
#define ll long long
#define mid (l+r)/2
#define left 2*i+1
#define righ 2*i+2

using namespace std;
ll q;
ll l,r;

ll sum(ll x){
    ll ret=(x/9)*45;
    x%=9;
    ret+=x*(x+1)/2;
    return ret;
}
int main()
{
    cin>>q;
    while(q--){
        cin>>l>>r;
        cout<<sum(r)-sum(l-1)<<endl;
    }
    return 0;
}

• Subtask 1: 50 / 50