//太费事了 #include<bits/stdc++.h> using namespace std; int main(){ cout<<"ABCDEFGHIJKLMNOPQR"<<endl; cout<<"BABCDEFGHIJKLMNOPQ"<<endl; cout<<"CBABCDEFGHIJKLMNOP"<<endl; cout<<"DCBABCDEFGHIJKLMNO"<<endl; cout<<"EDCBABCDEFGHIJKLMN"<<endl; cout<<"FEDCBABCDEFGHIJKLM"<<endl; cout<<"GFEDCBABCDEFGHIJKL"<<endl; cout<<"HGFEDCBABCDEFGHIJK"<<endl; cout<<"IHGFEDCBABCDEFGHIJ"<<endl; cout<<"JIHGFEDCBABCDEFGHI"<<endl; return 0; }