题解 | #矩阵乘法#
矩阵乘法
https://www.nowcoder.com/practice/ebe941260f8c4210aa8c17e99cbc663b
function genMatrix(x, y) {
return Array.from(new Array(x), () => new Array(y).fill(0));
}
function getItemSum(arrX, arrY) {
return arrX.reduce((sum, cur, index) => {
return sum += cur * arrY[index];
}, 0);
}
const m1x = parseInt(readline(), 10);
const m1y = m2x = parseInt(readline(), 10);
const m2y = parseInt(readline(), 10);
const m1 = genMatrix(m1x, m1y);
const m2 = genMatrix(m2x, m2y);
const res = genMatrix(m1x, m2y);
let index = 0;
let m = m1;
let lines;
while (line = readline()) {
lines = line.split(' ');
if (index > m.length - 1) {
index = 0;
m = m2;
}
lines.forEach((item, idx) => {
m[index][idx] = item;
});
index++;
}
// 求两个矩阵相乘的结果
m1.forEach((item, index) => {
for (let i = 0; i < m2y; i++) {
let arrY = m2.map(it => it[i]);
res[index][i] = getItemSum(item, arrY);
}
});
res.forEach(item => {
print(item.join(' '));
})
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