题解 | #字符个数统计#
字符个数统计
https://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
const readline = require('readline');
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
rl.on('line', function (line) {
const strs = line.split('');
const uniqueStrs = strs.filter((item, index) => strs.indexOf(item) === index);
console.log(uniqueStrs.length);
});
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