Submission #250650

#	Time	Username	Problem	Language	Result	Execution time	Memory
250650		oko	Trol (COCI19_trol)	C++14	50 / 50	1 ms	384 KiB

trol

#include<bits/stdc++.h>
using namespace std;
const long long mod=1e9+7;
int num(long long x)
{
    if((x%10)==x)return x;
    long long y=0;
    while(x)
    {
        y+=(x%10);
        x/=10;
    }
    return num(y);
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    //freopen(".in","r",stdin);
    //freopen(".out","w",stdout);
    int t;
    cin>>t;
    while(t--)
    {
        long long l,r,sum=0,f=0,ni=(1+2+3+4+5+6+7+8+9);
        cin>>l>>r;
        while(true)
        {
            int x=num(l);
            sum+=x;
            if(x==9)break;
            if(l==r)
            {
                f=1;
                break;
            }
            l++;
        }
        while(true)
        {
            int x=num(r);
            if(f||x==9)break;
            sum+=x;
            r--;
        }
        cout<<sum+(((r-l)/9)*ni)<<endl;
    }
}

• Subtask 1: 50 / 50