【洛谷P1061 Jam的计数法】搜索

分析

超级暴力，在尾部+1，再判断。

AC代码

type 
    arr=array[0..27]of longint;
var
    st:string;
    a:array[0..27]of longint;
    s,t,w,i:longint;
    
procedure print(a:arr);
var
    i:longint;
begin
    for i:=w downto 1 do write(chr(a[i]+96)); writeln;
end;

function check(a:arr):boolean;
var
    i:longint;
begin
    for i:=w-1 downto 1 do 
        if (a[i+1]<=a[i])and(not((a[i]>=s)and(a[i]<=t)and(a[i+1]>=s)and(a[i+1]<=t))) then exit(false);
    exit(true);
end;

procedure solve(a:arr);
var
    i,cnt,kkk:longint;
begin
    cnt:=0;
    while cnt<5 do 
    begin
        inc(a[1]); kkk:=1;
        for i:=1 to w do 
            if a[i]>t then
            begin
                a[i]:=s;
                inc(a[i+1]);
            end;
        for i:=w-1 downto 1 do 
            if a[i]<a[i+1] then a[i]:=a[i+1]+1;
        //print(a);
        if check(a) then 
        begin
            inc(cnt); print(a);
        end;
    end;
end;

begin
    readln(s,t,w);
    readln(st);
    for i:=w downto 1 do a[i]:=ord(st[w-i+1])-ord('a')+1;
    solve(a);
end.