Submission #485714

#	Time	Username	Problem	Language	Result	Execution time	Memory
485714		tato	Trol (COCI19_trol)	C++14	10 / 50	1 ms	204 KiB

trol

#include <bits/stdc++.h>
#define ll long long
using namespace std;
 
ll back(ll a)
{
	ll cnt=0;
	while(a>0)
		{
			cnt+=(a%10);
			a=a/10;
		}
		if(cnt>9)
			return back(cnt);
		else
		return cnt;
	
}
 
int main()
{
	int t;
	cin>>t;
	int b[12];
	b[0]=0;
	for(int i=1; i<=11; i++)
		b[i]=b[i-1]+i;
	
	while(t--)
	{
		ll l,r;
		cin>>l>>r;
		ll cnt=0;
	
			cnt=back(l);
			ll cnt1=back(r);
			if(cnt%9==0)
				{
					ll x=r-l;
					cnt=45*(x/9)+b[x%9]+cnt;
				}
			else
				{
					ll y=9-cnt;
					ll x=r-l;
					
					if(x>y)
					{
						x-=y;
						cnt=45*(x/9)+b[x%9]+(b[9]-b[cnt-1])+cnt;
					}
					else
						cnt=b[cnt1]-b[cnt-1];
					
				
				}
			
		cout<<cnt<<endl;
		
	}
	
	return 0;
}

• Subtask 1: 10 / 50