题解 | #合并表记录#

const readline = require('readline');

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

const lines = [];

rl.on('line', function (line) {
    const newLine = line.split(' ');
    if (newLine.length === 2) {
        const index = lines.findIndex((item) => item.index === newLine[0]);
        if (index > -1) {
            lines[index].value += parseInt(newLine[1]);
        } else {
            lines.push({
                index: newLine[0],
                value: parseInt(newLine[1]),
            })
        }
    }
});

rl.on('close', () => {
    lines.sort((a, b) => parseInt(a.index) - parseInt(b.index));
    lines.forEach((item) => console.log(`${item.index} ${item.value}`));
})