ps：两章之内把比赛写完。

    themitlicense(mit)copyright(c)<year><copyrightholders>

    permissionisherebygranted，freeofcharge，toanypersonobtainingacopyofthissoftwareandassociateddocumentationfiles(the“software“)，todealinthesoftwarewithoutrestriction，inc露dingwithoutlimitationtherightstouse，copy，摸dify，merge，publish，distribute，sublicense，and/orsellcopiesofthesoftware，andtopermitpersonstowhomthesoftwareisfurnishedtodoso，subjecttothefollowingconditions:

    theabovecopyrightnoticeandthispermissionnoticeshallbeinc露dedinallcopiesorsubstantialportionsofvided“asis“，withoutwarrantyofanykind，expressorimplied，inc露dingbutnotlimitedtothewarrantiesofmerchantability，fitnessforaparticularpurposeandnonieauthorsorcopyrightholdersbeliableforanyclaim，damagesorotherliability，whetherinanactionofcontract，tortorotherwise，arisingfrom，outoforinconnectionwiththesoftwareortheuseorotherdealingsin(mit)copyright(c)<year><copyrightholders>

    permissionisherebygranted，freeofcharge，toanypersonobtainingacopyofthissoftwareandassociateddocumentationfiles(the“software“)，todealinthesoftwarewithoutrestriction，inc露dingwithoutlimitationtherightstouse，copy，摸dify，merge，publish，distribute，sublicense，and/orsellcopiesofthesoftware，andtopermitpersonstowhomthesoftwareisfurnishedtodoso，subjecttothefollowingconditions:

    theabovecopyrightnoticeandthispermissionnoticeshallbeinc露dedinallcopiesorsubstantialportionsofvided“asis“，withoutwarrantyofanykind，expressorimplied，inc露dingbutnotlimitedtothewarrantiesofmerchantability，fitnessforaparticularpurposeandnonieauthorsorcopyrightholdersbeliableforanyclaim，damagesorotherliability，whetherinanactionofcontract，tortorotherwise，arisingfrom，outoforinconnectionwiththesoftwareortheuseorotherdealingsin(mit)copyright(c)<year><copyrightholders>

    permissionisherebygranted，freeofcharge，toanypersonobtainingacopyofthissoftwareandassociateddocumentationfiles(the“software“)，todealinthesoftwarewithoutrestriction，inc露dingwithoutlimitationtherightstouse，copy，摸dify，merge，publish，distribute，sublicense，and/orsellcopiesofthesoftware，andtopermitpersonstowhomthesoftwareisfurnishedtodoso，subjecttothefollowingconditions:

    theabovecopyrightnoticeandthispermissionnoticeshallbeinc露dedinallcopiesorsubstantialportionsofvided“asis“，withoutwarrantyofanykind，expressorimplied，“，withoutwarrantyofanykind，expressorimplied，