题解 | #字符个数统计#
字符个数统计
http://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
function getNum(str){
let set = new Set(str.split(''));
let num = Array.from(set).length;
console.log(num)
}
let line;
while(line=readline()){
getNum(line)
}
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