第二十章 交换（1 / 2）

PmMvPA2CgOOtgeepuOiPhOaPmumMvO+Bmui8neiCpuW6uuShh+WGp+iwiOWNuOSageWYv+iWu+SMvO+0r+ilneabnOacp+W5r+WGveQgPmM8PmMvPA2CgOOpmemOo+mEmuevgeaItuaynOmEs+aDv+WPsOWNuOSVveS7u+SJnOaavOSNuOSxsOWkreaCpuWMvO+rpOWmveiZv+i2iOWnjuaHm+i/jOWCremepeeolOevmOaMvO+Vs+aeiuWEmueTveWzqOeAnOaeruW2heUgPmM8PmMvPA2CgOOOn+WlgemXjeWGuuSAvOW7pue/vuSMvO+EmuezqOeJsuaquOSAuOSGuuSRjOabnOacp+UgPmM8PmMvPA2CgOOonOW6uuSJnOanpOWfueSrpOWmveiEmueUgOmcv+iRt+iPhOa/hOaMvO+LuOSLueSPteiNh+mCgOOmveisqemGvuiAuOSLuOSwueSljua0m+eMvO+inem6h+WAm+mJu+WvmOaYv+iOkOWAnOYgPmM8PmMvPA2CgOObiuW9g+iEmue9m+WoheWMoeiagOmJnOahsuaIj+WMoeisqemmveiEmueriOWGveSCgOOMh+mVveWNkOWEmueFvuWljuaNuOSGuuSlheWXiOWbnOacp+WKiuaMoeisqemmveiPsOaNsumMvO+OkOWLueS/geWUteiEmuedoumot+WonOW+mOaOmOaIvuUgPmM8PmMvPA2CgOOWu+SZu+emveisqemfp+ePhOa/hOaNuOSzhuWaneWLueS7gOaMvO+GuuSFl+erpOWmvei0r+ivmOaxsOWMvO+GuuSPneWmveisqem0r+ivmOaNuOSMvO+xhOiojuasiOi+meeMvO+OkOWLueS9u+SruuiEmueWu+SBr+iMqumonOWMoeisqemmveiPsOaNsumMvO+vmOaEmueQj+aAuOSXvuW8gOUgPmM8PmMvPA2CgOOVs+aeiuWzg+amj+WXvuW7oemMvO+Fg+aLuuSEmue7juWHv+i3t+alu+Svj+WmveisqemGvuiAuOSvmOaNuOS/vuSZgOW2l+awiOWMvO+DouW5vui5lua/peiEmueonOWwjue9m+WQvemGuuSwiOWxsOWfueSMvO+wnOWzmOmGuuSwiOWCgOOhg+mnheell+a7juWmveisqemQneWXrueTieaMvO+mveisqemGvuiAuOSGuuSfp+ewluaNh+mJueSNkOWEmueMoeiuv+SKuOSvt+ilu+SbnOacp+WMvO+MoeiPmumEmueCp+i5sOWwpempjuaGuuS6uOQgPmM8PmMvPA2CgOOMh+mjjOWpieeoguWbv+i2lOawnOWLueSNh+mMgOiNj+ebnOacp+WrouiMvO+lneaBgOmwleaCpuWvmOaYv+icnuaGteaBk+mXoum+meeEmuebnOacp+WUuuWUreeMvO+Vs+efs+eIueSOgOaNhuWFg+aDv+WHv+iNuOQgPmM8PmMvPA2CgOOJjuaekOW6uuSrouippOWAuOSJnOaameapl+aMvO+7juWLuOS3oOaZv+iNhuWCgOOlneaqnOaEmuePsOaJu+WGuuSilOmBpuePu+eyt+WMvO+onOWwjueGveSMvO+onOWYreWEmuePsOaJu+WGuuStu+e2u+WPu+e+m+aMiee9keWCgOOXgemgl+aynOm0muaxvOWameiEmuePsOaJu+WMvO+NieWinem/iuW6vOWEmueCp+i5sOWonOUgPmM8PmMvPA2CgOODv+WzhuWEmuePsOaJu+WvjOaNh+mBpuiGuuSaruWaneWRj+WIhOaWu+SpruivmOaqj+WGveQgPmM8PmMvPA2CgOOkreaCpuWvmOa0m+a0r+ilnea6uuS/ieanu+ePl+a2ruWEmue3oOaZv+iAm+mJu+W5r+WMvO+xvui7gOiNp+eAuOSvmOa9g+mZv+iMvO+0r+ilnea6uuSquOSAuOSPr+aEmuePsOaJu+W5r+WCgOOPneWIvuWFg+aDv+WAm+mJu+WXvuWekOaMvO+CpuWqh+i7juWlneaOn+WlgemXjeWonOWMvO+PsOaJu+W7h+WtouiCp+i5sOUgPmM8PmMvPA2CgOOppOWokeWGuuS6u+WEnuamkOWvmOaMvO+VveSCpuW6uOSuv+SonOWwjuePsOWkreWsi+eln+eNuOSqj+WCgOOfuuWToumvmOaYv+ifuuWToumlr+iMvO+WjOWYj+WIueSAu+SJnOaavOSNuOShruiwvOSNieWRkOWCgOOGuuS8pea3teaTkumem+WPu+eyt+Wlr+iUuuWavOSZv+i8kOenoue5q+eMvO+Xruelnea0l+m2l+aJjOYgPmM8PmMvPA2CgOOvt+i6oem9peWjreafueSUuOSMgOiMvO+Fg+aLuuSbuuSAuOSSjuaJruWMvO+6uuSEmueKuOSHlemKvueSnemBp+iBp+iMvO+LnOeAuOSLnOewnOWBsOWEmuext+Wqh+i7juWBpui2hOeTveWMvO+NieWLueS9m+WRuuSAvuW7juW9m+WQvemAvOW7pueonOUgPmM8PmMvPA2CgOO7juWMgOihg+mnheell+aAvuWMvO+svei/peikreaqh+ggPmM8PmMvPA2CgOOOn+WlgemXjeWAvOW7pueMvO+Am+mJu+WriOWevui/vuSppOWMuuSsrOebnOacp+UgPmM8PmMvPA2mgOKmgOIgPmM8PmMvPA2mgOKmgOIgPmM8PmMvPA2dgOKCgOOSjuaJruWgveSLnOejgumcgOKavO+LuOScgeWMvO+vnea2jOisveiGuuSsveiWu+SMvO+BheWUuuWEmuebnOacp+WGuuSXvuWMvO+Mv+WBpuegl+a+meeOueS8vOSCp+i5sOWGveQgPmM8PmMvPA2CgOOnv+WqoOWcnuaOkOWvmOa0m+aZiOWMvO+3huWzsuWlneaVvOWwiOWWi+avmOali+ggPmM8PmMvPA2CgOOCgOO7juW9keWhneaKjeWWu+SBpui9g+ifueSRsOWzh+iMvO+6nOWTveWAneawm+WWu+SGsOW0r+iNuOSMvO+vgeaItuaEmueWu+SWjeW6h+WZgOW2l+aZv+ionOWli+ibnOacp+UgPmM8PmMvPA2CgOOFg+aLuuSEmueQj+aAuOSXvuW8gOWIueSAu+SvmOaNuOSSgOWMvO+0r+ilneaCp+i5sOW5r+WmgOKmgOKwnOWPl+aPsOaJu+WlheWcveaEmuegtOeRiOaMoeiRiOaYv+iMvO+LuOS1huWFg+aEmueluOSuo+aHpOWSiOaNp+eZv+ionOWCgOOHlemQneWLieaYq+m6h+W+tOaMvO+cuuWhg+mhg+mzmOmkteioiuW3r+iYv+iMvO+zi+apiuW0j+aWpOWRsOWNuOSlnea3r+iMvO+IiOayueWoiuWnpOWPsOaJu+WMvO+OkOWLueStouiXj+WppOW9meeqh+ggPmM8PmMvPA2CgOOwo+WJnOawnOW3juaMvO+6r+i/ieaEmuebnOacp+WvmOaZv+ggPmM8PmMvPA2CgOOFg+aLuuS2u+SZv+iageW7juWbiuW9sOWavOSMvO+6r+i/ieaWu+SGveSCgOOZv+WuuOWWu+S3r+iFv+WNuOSfueSCp+i5sOWMvO+VjeWArueIueSZv+iJnOacnuaCpuWLuuSZv+i6uOSgm+WMvO+wiOWageWlu+Svj+WaruWAuOSBr+idv+S9g+iNuOSWu+QgPmM8PmMvPA2dgOKCgOObiuW9sOWavOSRiOacgOKavO+TgemOkOW2hOeMvO+zg+aGuuSzg+awnOWfnOekruibnOacp+UgPmM8PmMvPA2CgOOIoeaUreeEmueMkOWNuOSJnOa9g+m4ruiWiOaMvO+Rj+W6h+Wruuiqh+iOu+S6uuSquOSPr+aCgOO7pueDgOm6uuSqveeEmueJvOeagOm9m+WQvemrouipiuWuuOWMvO+pmemEmuenpOW3oOaZv+iShuWXvuW8gOWNuOS8gOWVuuWwiOWFg+a6uuSZv+iMvO+PsOaJu+WHv+i+lOaMvO+Am+mJu+WAneaNuOQgPmM8PmMvPA2CgOO0r+iCp+i5sOWdgOKCgOO9m+WQvemAvOW7pueRiOaBgOmcgOIgPmM8PmMvPA2CgOOul+mljua0m+ebnOacp+WdgOKfvO+LuuSIueSAu+ScgOIgPmM8PmMvPA2CgOOdgOKCp+i5sOWcgOKIvuWZv+ggPmM8PmMvPA2CgOOLuuS2u+SAuOSageWWu+SuuOWMvO+JjuaYv+i7iOWLq+eCseaBpuixsOWWu+SMvO+Fg+a6uuSquOSAuOSWu+SGuuSgrOabnOacp+WMvO+onOWwjucgPmM8PmMvPA2CgOOolOepiOW6uuSrouimkOWvmOaOueSonOWNuOSfueSzh+ialOeMvO+1ruaLieaIueSAu+SHv+iagOmOueSonOWNuOS2ueWMvO+HoOaum+eEmuext+Wqh+iQiOaMruWBpuiqj+WWu+SCgOO6uuSEmueuoeeOmOa4uOWenemHoOaum+equOSAuOSvmOaWu+SMvO+lnea6h+WLnOelu+Svj+W5gueAuOSZv+iOu+QgPmM8PmMvPA2CgOOPhOaonOWNuOS2ueWfueSPg+W9peWWu+SMvO+SiOWhruiEmuext+Wqh+iGuuSQiOaMruW6nOafgOWYv+iMvO+vuueVjeWNuOS2ueWEmueum+ecg+iEjueNh+mVgOaqk+UgPmM8PmMvPA2CgOOFuOakuOS6uOSkruiCgOO3teiQj+aNhuWNuOSxsOWWu+SMvO+OkOWLueSEt+a0uOSbv+i3t+aTgemguOaEp+ijreaHv+iagOmWu+SuuOW6uuS+ieabnOacp+WMvO+9keWAuOSbnOacp+WRleaMh+mLieaipeWPi+ionOWWu+SPg+WxsOUgPmM8PmMvPA2CgOO0l+mLueS1v+WAuOSWu+SonOWoheWMvO+0muaXsueVjeWArue4uOWenemfueSdgOKzueWsheWcgOKNp+eZv+iMvO+2hOeTveUgPmM8PmMvPA2CgOOZiOWfjuWEmueTmOakuuSzueWsheWqvuW1gemMvO+3oOaAuOSro+Wuv+Sol+mGleWPg+W0m+aMgOiNj+WMvO+7seeLueS6r+i/ieaBgOOJueSFg+aIueSAu+Shv+S4m+eNuOS2ueWOueS8vOSWu+QgPmM8PmMvPA2CgOOZiOWGh+WEmuext+Wqh+iWu+SXpeWAuOSJnOaLuuSageWMvO+6uuSquOSZv+iCp+i5sOUgPmM8