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  1. program rollercoaster3;
  2. var N,K,i,countH, speed :Longint;
  3.     S : Ansistring;
  4.     roller : array[1..100] of Longint;
  5.  
  6. begin
  7.  
  8.  
  9.     ReadLn(N);
  10.  
  11.     ReadLn(S);
  12.     K := 0; countH:=0; speed:=0;
  13.  
  14.     { INSERT YOUR CODE HERE }
  15.     if S[1]='U' then begin K:=-1; WriteLn(K); exit; end;
  16.  
  17.     for i:=1 to N do 
  18.                        Case S[i] of  
  19. 				'D' : roller[i]:=9;
  20. 				'U' : roller[i]:=-11;  
  21. 				'H' : roller[i]:=0;  
  22. 		                'B' : roller[i]:=10; 
  23.                       end;
  24.     for i:=1 to N do 
  25.                     begin
  26.                        if S[i]='H' then countH:=countH+1;
  27.                        speed:=speed+roller[i]; 
  28.                        if speed<=0 then
  29.                                       begin
  30.                                         if countH>0 then 
  31.                                                      begin 
  32.                                                        countH:=countH-1;
  33.                                                        speed:=speed + 10;
  34.                                                        k:=k+1;
  35.                                                      end
  36.                                                     else
  37.                                                       begin
  38.                                                         k:=-1;
  39.                                                         break;
  40.                                                       end;
  41.                                       end;
  42.  
  43.                     end;                
  44.     WriteLn(K);
  45. end.
  46.  
  47.  
Success #stdin #stdout 0.01s 5292KB
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https://ideone.com/XKqJYx
language:
Pascal (fpc 3.0.4)
created:
8 days ago
visibility:
public

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