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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.      section : array [1..4] of Longint;
  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.     for i:=1 to 4 do section[i]:=0;  
  19.     for i:=1 to N do 
  20.                        Case S[i] of  
  21. 				'D' : begin roller[i]:=9; section[1]:=section[1]+1; end;
  22. 				'U' : begin roller[i]:=-11;  section[2]:=section[2]+1; end; 
  23. 				'H' : begin roller[i]:=0;   section[3]:=section[3]+1; end; 
  24. 		                'B' : begin  roller[i]:=10;  section[4]:=section[4]+1; end;
  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) and (i=N))) then begin K:=-1; WriteLn(K); exit; end;
  37.                                                        K:=K+1;                                                       
  38.                                                      end
  39.                                                     else  begin K:=-1; WriteLn(K); exit; end;                                                                                                      
  40.                                       end;  
  41.                     end;  
  42. WriteLn(K);     
  43. end.
Success #stdin #stdout 0s 5308KB
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https://ideone.com/U2ARIB
language:
Pascal (fpc 3.0.4)
created:
11 hours ago
visibility:
public

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