Method put

java/0460-lfu-cache.java:30–45

(int key, int value)

    }

    public void put(int key, int value) {
        if (capacity == 0) return;
        if (entries.containsKey(key)) {
            Entry e = entries.get(key);
            e.value = value;
            updateFrequency(e);
        } else {
            if (entries.size() == capacity) {
                evictLeastFrequent();
            }
            Entry e = new Entry(key, value, 1);
            entries.put(key, e);
            freqMap.computeIfAbsent(1, k -> new LinkedHashSet<>()).add(e);
            minFreq = 1; // Reset min frequency to 1 for new entry
        }
    }

    private void updateFrequency(Entry e) {
        int oldFreq = e.freq;