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  1. program rollercoaster3;
  2. var N,K,i,countH, speed :int64;
  3.     S : Ansistring;
  4.     roller : array[1..100] of int64;
  5.  
  6.  
  7. begin
  8.     (*assign(input,  'input.txt');  reset(input);
  9.     assign(output, 'output.txt'); rewrite(output);*)
  10.  
  11.     ReadLn(N);
  12.  
  13.     ReadLn(S);
  14.     K := 0; countH:=0; speed:=0; 
  15.  
  16.     { INSERT YOUR CODE HERE }
  17.     if S[1]='U' then begin K:=-1; WriteLn(K); exit; end; 
  18.  
  19.     for i:=1 to N do 
  20.                       Case S[i] of  
  21. 						'D' : roller[i]:=9; 
  22. 						'U' : roller[i]:=-11;  
  23. 						'H' : roller[i]:=0;   
  24. 		        		'B' : roller[i]:=10;  
  25.                       end;
  26.     for i:=1 to N do 
  27.                     begin
  28.                        if S[i]='H' then countH:=countH+1;                        
  29.                        speed:=speed+roller[i]; 
  30.                        if speed<=0 then
  31.                                       begin
  32.                                           if countH>0 then 
  33.                                                      begin 
  34.                                                        countH:=countH-1;
  35.                                                        speed:=speed + 10;
  36.                                                        if ((speed=0) and (countH>0)) then begin speed:=speed + 10; K:=K+1; countH:=countH-1;end
  37.                                                                                      else if ((speed<=0) and ((countH<=0) or (i=N))) then begin K:=-1; WriteLn(K); exit; end;
  38.                                                        K:=K+1;                                                       
  39.                                                      end
  40.                                                     else  begin K:=-1; WriteLn(K); exit; end;                                                                                                      
  41.                                       end;  
  42.                     end;  
  43. WriteLn(K);     
  44. end.
Success #stdin #stdout 0s 5324KB
comments (?)
stdin 
23
HHHHHHHHHHHHUUUUUUUUUUD
stdout 
12
https://ideone.com/9fU7Bx
language:
Pascal (fpc 3.0.4)
created:
1 day ago
visibility:
public

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