Submission #199190

#	Time	Username	Problem	Language	Result	Execution time	Memory
199190		silxikys	Trol (COCI19_trol)	C++14	50 / 50	54 ms	376 KiB

trol

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

ll f(ll x) {
    ll d = 0;
    while (x > 0) {
        d += x % 10;
        x /= 10;
    }
    return d < 10 ? d : f(d);
}

int main() {
    int t; cin >> t;
    while (t--) {
        ll l, r; cin >> l >> r;
        if (r-l <= 1000) {
            ll ans = 0;
            for (ll i = l; i <= r; i++) {
                ans += f(i);
            }
            cout << ans << '\n';
            continue;
        }
        ll ans = 0;
        while (l <= r && l % 9 != 1) {
            ans += f(l);
            l++;
        }
        while (r >= l && r % 9 != 0) {
            ans += f(r);
            r--;
        }
        ll num = (r-l+1)/9;
        ans += 45LL*num;
        cout << ans << endl;
    }
}

• Subtask 1: 50 / 50