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Submission #217383

# Submission time Handle Problem Language Result Execution time Memory
217383 2020-03-29T13:42:36 Z bayemirov Trol (COCI19_trol) C++17
50 / 50
 5 ms 384 KB 
//bayemirov                                       
#include <bits/stdc++.h>               

using namespace std;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

typedef long long ll;

#define pb push_back

ll g(ll x) {
	return x * (x + 1) / 2;
}

ll sumofDigits(ll x, ll res = 0) {
	while (x) {
		res += x % 10;
		x /= 10;
	}
	return res;
}

ll get(ll x) {
	while (x >= 10) 
		x = sumofDigits(x);
	return x;
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	int q;
	cin >> q;
	while (q--) {
		ll l, r;
		cin >> l >> r;
		ll ans = 0;
		ll pref = get(l);
		ll suff = get(r);
		ll k = r/9 - (l-1)/9;
		if (pref > 1) k--;
		if (k == 0) {
			while (l <= r) { 
				ans += get(l);
				l++;
			}
			cout << ans << "\n";
			continue;
		}
		ans = k * 45;
		while (pref > 1ll && pref < 10ll)
			ans += pref++;
		if (suff < 9)
			ans += g(suff);
	  	cout << ans << "\n";
	}
	return 0;
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 5 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 5 ms 384 KB Output is correct
5 Correct 5 ms 384 KB Output is correct