This problem is in Contest(s) below:
Contest 1389:工管1701高级语言程序设计作业(3)
Contest 1390:信管1701-02高级语言程序设计作业(3)
Contest 1335:通工1607-09C语言作业(3)
Contest 1336:通工1610-11 C语言作业(3)