题解 | #字符个数统计#
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
var str = readline();
let arr = str.split('')
var newArr = [...new Set(arr)];//数组去重
print(newArr.length)
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
var str = readline();
let arr = str.split('')
var newArr = [...new Set(arr)];//数组去重
print(newArr.length)
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