题解 | #矩阵乘法#

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
    while(line = await readline()){
        const x = +line
        // 转化整数否则出错
        const y = +await readline()
        const z = +await readline()
        const firstMatrix = []
        const secondMatrix = []
        
        for (let i = 0 ; i < x; i++){
            let line = (await readline()).split(' ')
            firstMatrix.push(line)
        }
        for (let i = 0; i < y; i++){
            let line = (await readline()).split(' ')
            secondMatrix.push(line)
        }
        // 二维数组，如果仅仅new Array(x)并不fill(0) map出错
        const newArray = new Array(x).fill(0).map(_=>{
            return new Array(z).fill(0)
        })
        for (let i = 0; i < x; i++){
            for (let j = 0; j < z; j++){
                const row = firstMatrix[i]
                // 二维数组，如果仅仅new Array(x)并不fill(0) map出错
                const col = new Array(y).fill(0).map((_, index)=>{
                    return secondMatrix[index][j]
                })
                let temp = 0
                for(let k = 0; k < y; k++){
                    temp += row[k]*col[k]
                }
                newArray[i][j] = temp
            }
        }
        // 输出结果
        for (let i = 0; i < newArray.length; i++){
            console.log(newArray[i].join(' '))
        }
    }
}()

死题目，注意二维数组创建的方式就好