제출 #305931

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
305931		llaki	비스킷 담기 (IOI20_biscuits)	Java	21 / 100	1200 ms	99144 KiB

biscuits

import java.util.HashMap;

public class biscuits {
    long count_tastiness(long x, long[] a) {
        HashMap<Long, Long> freq = new HashMap<>();
        freq.put(a[0], 1l);
        for (int pos = 0; pos < a.length - 1; pos++) {
            HashMap<Long, Long> map = new HashMap<>();
            for (long y : freq.keySet()) {
                long val = a[pos + 1] + y / 2;
                Long oldFreq = map.get(val);
                map.put(val, (oldFreq != null ? oldFreq.longValue() : 0) + freq.get(y));
                if (y >= x) {
                    val = a[pos + 1] + (y - x) / 2;
                    oldFreq = map.get(val);
                    map.put(val, (oldFreq != null ? oldFreq.longValue() : 0) + freq.get(y));
                }
            }
            freq = map;
        }
        long ans = 0;
        for (long y : freq.keySet()) {
            ans += freq.get(y) * (y / x + 1);
        }
        return ans;
    }
}

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