This problem is in Contest(s) below:
Contest 1337:2019好嗨哟
Contest 1316:2018小六 循环训练
Contest 1327:循环练习
Contest 1339:数组练习题
Contest 1348:数组
Contest 1362:训练
Contest 1522:小六数组练习
Contest 1523:小六数组练习2
Contest 1048:寒假训练
Contest 1332:2019小六训练题集
Contest 1195:2018小六第七场
Contest 1445:2019小六循环练习3
Contest 1508:初一小朋友循环回顾
Contest 1054:初二小盆友
Contest 1177:初一小朋友训练
Contest 1169:小P孩的寒假作业
Contest 1482:寒假入门2班
Contest 1211:复习赛
Contest 1280:2018小六练习
Contest 1162:初一小朋友寒假作业
Contest 1387:求和
Contest 1365:训练111