直接做该问题，请点击这里。
参与竞赛做该题，请点击以下竞赛项目.
This problem is in Contest(s) below:
Contest 1178:18软1--Week13
Contest 1180:18软3--Week13
Contest 1534:软四练习
Contest 1535:软3 11.18小测试
Contest 1164:2018-11-13计科2班课堂测试
Contest 1674:20221025数组（计2）
Contest 1191:18计科1班课堂测试1204
Contest 1898:EIM二维数组练习(最后一题学有余力的同学选做)
Contest 1407:20软工4班第四次练习
Contest 1409:20软工3班第四次练习
Contest 1673:20221025数组（计1）
Contest 1676:22计3二维数组
Contest 1678:22计4二维数组
Contest 1427:20 软5竞赛5
Contest 1216:18软1、软3--复习3--
Contest 1948:23软1-数组-练习2
Contest 1282:19软5练习3
Contest 1949:23软2-数组-练习2
Contest 1529:21软工3班—实验4—二维数组2
Contest 1108:17计2-复习2-Week18
Contest 1538:21软工4班—实验4—二维数组2
Contest 1109:17计-复习2-Week18
Contest 1532:实验4-数组编程--21软2
Contest 1533:实验4-数组编程--21软1