Submission #1107398

#	Time	Username	Problem	Language	Result	Execution time	Memory
1107398		toast12	Trol (COCI19_trol)	C++14	10 / 50	1 ms	336 KiB

trol

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

using ll = long long;

int sum_of_digits(ll x) {
    if (x/10 == 0) return x;
    ll temp = 0;
    while (x > 0) {
        temp += x%10;
        x /= 10;
    }
    return sum_of_digits(temp);
}

int main() {
    int q;
    cin >> q;
    while (q--) {
        ll l, r;
        cin >> l >> r;
        ll ans = 0;
        ll start = l, end = r;
        for (int i = l; (i % 10 != 0) && (i <= r); i++) {
            ans += sum_of_digits(i);
            start = i;
        }
        start++;
        if (r/10 > l/10) {
            for (int i = r; (i % 10 != 9) && (i >= l); i--) {
                ans += sum_of_digits(i);
                end = i;
            }
        }
        if (end-start+1 >= 10) {
            ans += 1ll*45*((end-start+1)/10);
            ll x = sum_of_digits(start);
            ll y = sum_of_digits((end-1)/10);
            if (y < x) {
                ans += 1ll*45-(x*(x-1)/2);
                x = sum_of_digits(end);
                ans += end*(end+1)/2;
            }
            else {
                ans += y*(y+1)/2;
                ans -= x*(x-1)/2;
            }
        }
        cout << ans << '\n';
    }
    return 0;
}

• Subtask 1: 10 / 50