题解 | #多组_二维数组_T组形式#

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
    let countGroup = 0
    let grouplineCount = 0
    let groupTotals = 0
    while(line = await readline()){
        let tokens = line.split(' ');
        // 没有分组统计数量，先存储分组统计数量
        if (countGroup === 0) {
            countGroup = parseInt(tokens[0], 10)
        // 没有分组长度信息，插入分组
        } else if (grouplineCount === 0) {
            grouplineCount = parseInt(tokens[0], 10)
        } else {
            grouplineCount -= 1
            tokens.forEach((item) => {
                groupTotals += parseInt(item, 10)
            })
          // 到达分组最后一个，重置统计信息  
		  if (grouplineCount === 0) {
                console.log(groupTotals)
                groupTotals = 0
            }
        }
    }
}()