public void aa() { int[] a = { 1, 2, 3, 4, 5, 4, 3, 2, 1 }; Hashtable ht = new Hashtable(); for (int i = 0; i < a.Length; i++) { if (ht.ContainsKey(a[i])) { ht.Add(a[i], (int)ht[i] + 1); } else { ht.Add(a[i], 1); } } string str = ""; foreach (DictionaryEntry item in ht) { str += item.Key + ":" + item.Value + " "; } }
时间: 2024-10-05 21:12:01