5. 全量和已占用字符集、字符串统计

const readline = require('readline');
const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
});

rl.on('line', (input) => {
    const input = 'a:3,b:5,c:2@a:1,b:2';
    const arr = input.split('@');
    const fullStr = arr[0];
    const hasStr = arr[1];
    let fullArr = fullStr.split(',');
    let hasArr = hasStr.split(',');
    let fullObj = {};
    for(let i=0; i<fullArr.length; i++) {
        let arr1 = fullArr[i].split(':');
        fullObj[arr1[0]] = arr1[1];
    }
    for(let i=0; i<hasArr.length; i++) {
        let arr1 = hasArr[i].split(':');
        if (fullObj[arr1[0]]) {
            fullObj[arr1[0]] = fullObj[arr1[0]] - arr1[1];
        }
    }
    let ans = [];
    for(let i in fullObj) {
        if (fullObj[i] > 0) {
            ans.push(`${i}:${fullObj[i]}`);
        }
    }
    console.log(ans.join(','));
})