题解 | #字符个数统计#
字符个数统计
http://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
const arr = readline().split('');
const res = [...new Set(arr)].length;
console.log(res);
字符个数统计
http://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
const arr = readline().split('');
const res = [...new Set(arr)].length;
console.log(res);
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