Submission #221128

#	Time	Username	Problem	Language	Result	Execution time	Memory
221128		eohomegrownapps	Trol (COCI19_trol)	C++14	50 / 50	5 ms	384 KiB

trol

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;

vector<ll> pref;

ll suminc(ll x){
	if (x==0){
		return 0;
	}
	return pref[9]*(x/9)+pref[(x%9)];
}

int main(){
	cin.tie(0);
	ios_base::sync_with_stdio(0);
	int q;
	cin>>q;
	pref.resize(10,0);
	for (int i = 1; i<=9; i++){
		pref[i]=pref[i-1]+i;
	}
	for (int i = 0; i<q; i++){
		ll l,r;
		cin>>l>>r;
		cout<<(suminc(r)-suminc(l-1))<<'\n';
	}
	return 0;
}

• Subtask 1: 50 / 50