Submission #313821

#	Time	Username	Problem	Language	Result	Execution time	Memory
313821		srvlt	Packing Biscuits (IOI20_biscuits)	C++14	9 / 100	105 ms	384 KiB

biscuits

#include "biscuits.h"
#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define SZ(x) (int)(x).size()
#define all(x) begin(x), end(x)
using namespace std;

const int n0 = 1e5;

ll count_tastiness(ll x, vector<ll> a) {
	ll s = 0;
	for (ll i = 0; i < SZ(a); i++)
		s += (1ll << i) * a[i];
	if (x > s) return 1;
	ll res = 0;
	if (s <= n0) {
		for (ll i = 0; i <= s; i++) {
			ll cur = 0;
			for (ll j = 59; j >= 0; j--) {
				if (i >> j & 1) cur += x;
				if (j < SZ(a))
					cur -= min(cur, a[j]);
				cur *= 2;
			}
			res += (cur == 0);
		}
	}	else if (x == 1) {
		ll r = 0, res = 1, cur = 1;
		for (ll j = 0; j < SZ(a); j++) {
			if (!a[j]) continue;
			ll t = (1ll << j) / cur;
			if (t > r + 1) {
				res *= (r + 1);
				cur = (1ll << j);
				r = 0;
			}
			t = (1ll << j) / cur;
			if (t <= r + 1) r += a[j] * t;
		}
		res *= (r + 1);
	}
	return res;
}

• Subtask 1: 9 / 9
• Subtask 2: 0 / 12
• Subtask 3: 0 / 21
• Subtask 4: 0 / 35
• Subtask 5: 0 / 23