I cant understand my mistake for WA2. I tried it on my PC. Its work.

Edited by author 19.10.2013 14:34

can you post your code？

Edited by author 19.10.2013 16:29

Edited by author 19.10.2013 16:28

var
    s,s1,s2: string;
    i,f,n,m,k,l,p,j,code: longint;
    ch:char;
begin
    readln(s);
    readln(n);
    for i:=1 to n do
    begin
        readln(s2);
        if s2[1]='p' then
        begin
             Val(s2[13],j,code);
             Val(s2[15],k,code);
             s1:=copy(s,j,k-j+1);
             f := 0;
             for  p:= 1 to length(s1) div 2 do
             if s1[p] <> s1[length(s1)-p+1] then
             begin
                  writeln('No');
                  f := 1;
             end;
             if f = 0 then
             writeln('Yes');
        end else
        begin
             Val(s2[8],m,code);
             ch:=s2[10];
             delete(s,m,1);
             insert(ch, s,m);
        end;
    end;
end.

Maybe multiple No's? But you will take TLE.

Try this test:

aacdeabcdeabcdeabcde
1
palindrome? 1 20

thx.