复习英语单词80个；背写单词36个；完善栈地回文代码：includeincludeusingnamespacestd;intmain(){intlength;cin>>length;cin.ignore();//忽略长度输入后的换行符stringstr;//逐个字符输入字符串charch;boolhasSpace=false;for(inti=0;i<lengt