题解 | #活动安排#

排序结束时间最早，开始时间最大的排前面

const rl = require("readline").createInterface({ input: process.stdin });
var iter = rl[Symbol.asyncIterator]();
const readline = async () => (await iter.next()).value;

void (async function () {
    // Write your code here
    await readline();
    let arr = [];
    while ((line = await readline())) {
        arr.push(line.split(" "));
    }

    arr.sort((x, y) => {
        const [startX, endX] = x;
        const [startY, endY] = y;
        if (endX !== endY) {
            return endX - endY;
        }

        return startY - startX;
    });

    let arr2 = [];
    let num = 0;

    arr.forEach((item) => {
        const [start, end] = item;
        if (!arr2.length || +arr2[arr2.length - 1] <= start) {
            arr2.push(end);
            num++;
        }
    });

    console.log(num);
})();