Submission #615970

#	Time	Username	Problem	Language	Result	Execution time	Memory
615970		fvogel499	Packing Biscuits (IOI20_biscuits)	C++17	100 / 100	21 ms	1244 KiB

biscuits

#include "biscuits.h"
#include <bits/stdc++.h>

using namespace std;

#define vi vector<int>
#define int long long
#define pb push_back
#define ins insert
#define sz(x) (int)((x).size())

long long count_tastiness(long long x, std::vector<long long> b) {
	while (sz(b) < 60) b.push_back(0);
	int lim [60+1];
	int sum = 0;
	for (int i = 0; i < 60; i++) {
		sum += (1LL<<i)*b[i];
		lim[i] = min(sum/x, (1LL<<(i+1))-1);
	}
	lim[60] = (1LL<<60)-1;
	int dp [60][60+1];
	for (int i = 0; i <= 60; i++) {
		if (lim[0] == 0 || (lim[i]&1) == 0) {
			dp[0][i] = 1;
		}
		else {
			dp[0][i] = 2;
		}
	}
	for (int i = 1; i < 60; i++) for (int j = 0; j <= 60; j++) {
		int resultingMask = (1LL<<(i))-1;
		dp[i][j] = 0;
		if (((lim[i]>>i)&1) && ((lim[j]>>i)&1)) {
            int newJ = j;
            if ((lim[i]&resultingMask) < (lim[j]&resultingMask)) {
                newJ = i;
            }
			dp[i][j] += dp[i-1][newJ]; // add one
			dp[i][j] += dp[i-1][60]; // add zero
		}
		else if (!((lim[i]>>i)&1) && !((lim[j]>>i)&1)) {
			int newJ = j;
            if ((lim[i]&resultingMask) < (lim[j]&resultingMask)) {
                newJ = i;
            }
			dp[i][j] += dp[i-1][newJ]; // add zero
		}
        else if ((lim[i]>>i)&1) {
            dp[i][j] += dp[i-1][j];
        }
        else {
            dp[i][j] += dp[i-1][i];
        }
	}
	int res = dp[60-1][60];
	return res;
}

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