题解 | #矩阵乘法#

const rl = require("readline").createInterface({ input: process.stdin });

const inputArr = []
rl.on('line',line => {
    inputArr.push(line.trim())
})
rl.on('close',() => {
    const arr1 = []
    const arr2 = []
    const x = parseInt(inputArr[0])
    const y = parseInt(inputArr[1])
    const z = parseInt(inputArr[2])
    for(let i = 0;i < x;i++) {
        arr1[i] = inputArr[3 + i].split(' ').map(e => parseInt(e))
    }
    for(let i = 0;i < y;i++) {
        arr2[i] = inputArr[3 + x + i].split(' ').map(e => parseInt(e))
    }
    const res = []
    for(let i = 0;i < x;i++) {
        res[i] = []
        for(let j = 0;j < z;j++) {
            let t = 0
            for(let k = 0;k < y;k++) {
                t += arr1[i][k] * arr2[k][j]
            }
            res[i][j] = t 
        }
    }
    res.forEach(e => console.log(e.join(' ')))
})

套公式即可