A word or a sentence in some language is called a pangram if all the characters of the alphabet of this language appear in it at least once. Pangrams are often used to demonstrate fonts in printing or test the output devices.
You are given a string consisting of lowercase and uppercase Latin letters. Check whether this string is a pangram. We say that the string contains a letter of the Latin alphabet if this letter occurs in the string in uppercase or lowercase.
The first line contains a single integer n (1 ≤ n ≤ 100) — the number of characters in the string.
The second line contains the string. The string consists only of uppercase and lowercase Latin letters.
第一行包含了一個單獨的整數 n (1 ≤ n ≤ 100) — 字串有幾個字元。
第二行包含了那個字串,由大寫或小寫的拉丁字母所組成。
輸出
Output “YES”, if the string is a pangram and “NO” otherwise.
要是這個字串是一個 pangram 就印出 “YES”,反之則印出 “NO”。
範例
輸入
12 toosmallword
輸出
NO
輸入
35 TheQuickBrownFoxJumpsOverTheLazyDog
輸出
YES
解題思路
這一題因為輸入的很單純,只有大寫或小寫的字母
所以其實我們可以用HashSet來儲存出現過的字母並判斷總長度就可以了
當然要先將整個字串轉成大寫或是小寫,任一即可
C#解決方案
方案1 – HashSet
int n = int.Parse(Console.ReadLine()); //unused
char[] s = Console.ReadLine().ToLower().ToCharArray();
HashSet<char> hSet = new HashSet<char>();
foreach(char c in s){
hSet.Add(c);
}
Console.WriteLine(hSet.Count == 26 ? "YES" : "NO");
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