Update all new Tasks

This commit is contained in:
Ingy döt Net 2015-02-20 09:02:09 -05:00
parent 00a190b0a6
commit 91df62d461
5697 changed files with 93386 additions and 804 deletions

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program AmicablePairs;
{$IFDEF FPC}
{$MODE DELPHI}
{$H+}
{$ELSE}
{$APPTYPE CONSOLE}
{$ENDIF}
uses
sysutils;
const
MAX = 20000;
//MAX = 20*1000*1000;
type
tValue = LongWord;
tpValue = ^tValue;
tPower = array[0..31] of tValue;
tIndex = record
idxI,
idxS : Uint64;
end;
var
Indices : array[0..511] of tIndex;
//primes up to 65536 enough until 2^32
primes : array[0..6542] of tValue;
procedure InitPrimes;
// sieve of erathosthenes without multiples of 2
type
tSieve = array[0..(65536-1) div 2] of char;
var
ESieve : ^tSieve;
idx,i,j,p : LongINt;
Begin
new(ESieve);
fillchar(ESieve^[0],SizeOF(tSieve),#1);
primes[0] := 2;
idx := 1;
//sieving
j := 1;
p := 2*j+1;
repeat
if Esieve^[j] = #1 then
begin
i := (2*j+2)*j;// i := (sqr(p) -1) div 2;
if i > High(tSieve) then
BREAK;
repeat
ESIeve^[i] := #0;
inc(i,p);
until i > High(tSieve);
end;
inc(j);
inc(p,2);
until j >High(tSieve);
//collecting
For i := 1 to High(tSieve) do
IF Esieve^[i] = #1 then
Begin
primes[idx] := 2*i+1;
inc(idx);
IF idx>High(primes) then
BREAK;
end;
dispose(Esieve);
end;
procedure Su_append(n,factor:tValue;var su:string);
var
q,p : tValue;
begin
p := 0;
repeat
q := n div factor;
IF q*factor<>n then
Break;
inc(p);
n := q;
until false;
IF p > 0 then
IF p= 1 then
su:= su+IntToStr(factor)+'*'
else
su:= su+IntToStr(factor)+'^'+IntToStr(p)+'*';
end;
procedure ProperDivs(n: Uint64);
//output of prime factorization
var
su : string;
primNo : tValue;
p:tValue;
begin
str(n:8,su);
su:= su +' [';
primNo := 0;
p := primes[0];
repeat
Su_Append(n,p,su);
inc(primNo);
p := primes[primNo];
until (p=0) OR (p*p >= n);
p := n;
Su_Append(n,p,su);
su[length(su)] := ']';
writeln(su);
end;
procedure AmPairOutput(cnt:tValue);
var
i : tValue;
r_max,r_min,r : double;
begin
r_max := 1.0;
r_min := 16.0;
For i := 0 to cnt-1 do
with Indices[i] do
begin
r := IdxS/IDxI;
writeln(i+1:4,IdxI:16,IDxS:16,' ratio ',r:10:7);
IF r < 1 then
begin
writeln(i);
readln;
halt;
end;
if r_max < r then
r_max := r
else
if r_min > r then
r_min := r;
IF cnt < 20 then
begin
ProperDivs(IdxI);
ProperDivs(IdxS);
end;
end;
writeln(' min ratio ',r_min:12:10); writeln(' max ratio ',r_max:12:10);
end;
procedure SumOFProperDiv(n: tValue;var SumOfProperDivs:tValue);
// calculated by prime factorization
var
i,q, primNo, Prime,pot : tValue;
SumOfDivs: tValue;
begin
i := N;
SumOfDivs := 1;
primNo := 0;
Prime := Primes[0];
q := i DIV Prime;
repeat
if q*Prime = i then
Begin
pot := 1;
repeat
i := q;
q := i div Prime;
Pot := Pot * Prime+1;
until q*Prime <> i;
SumOfDivs := SumOfDivs * pot;
end;
Inc(primNo);
Prime := Primes[primNo];
q := i DIV Prime;
{check if i already prime}
if Prime > q then
begin
prime := i;
q := 1;
end;
until i = 1;
SumOfProperDivs := SumOfDivs - N;
end;
function Check:tValue;
const
//going backwards
DIV23 : array[0..5] of byte =
//== 5,4,3,2,1,0
(1,0,0,0,1,0);
var
i,s,k,n : tValue;
idx : nativeInt;
begin
n := 0;
idx := 3;
For i := 2 to MAX do
begin
//must be divisble by 2 or 3 ( n < High(tValue) < 1e14 )
IF DIV23[idx] = 0 then
begin
SumOFProperDiv(i,s);
//only 24.7...%
IF s>i then
Begin
SumOFProperDiv(s,k);
IF k = i then
begin
With indices[n] do
begin
idxI := i;
idxS := s;
end;
inc(n);
end;
end;
end;
dec(idx);
IF idx < 0 then
idx := high(DIV23);
end;
result := n;
end;
var
T2,T1: TDatetime;
APcnt: tValue;
begin
InitPrimes;
T1:= time;
APCnt:= Check;
T2:= time;
AmPairOutput(APCnt);
writeln('Time to find amicable pairs ',FormatDateTime('HH:NN:SS.ZZZ' ,T2-T1));
{$IFNDEF UNIX} readln;{$ENDIF}
end.

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program AmicablePairs;
{find amicable pairs in a limited region 2..MAX
beware that >both< numbers must be smaller than MAX
there are 455 amicable pairs up to 524*1000*1000
correct up to
#437 460122410
}
//optimized for freepascal 2.6.4 32-Bit
{$IFDEF FPC}
{$MODE DELPHI}
{$OPTIMIZATION ON,peephole,cse,asmcse,regvar}
{$CODEALIGN loop=1,proc=8}
{$ELSE}
{$APPTYPE CONSOLE}
{$ENDIF}
uses
sysutils;
const
//MAX = 20000;
{$IFDEF UNIX} MAX = 524*1000*1000;{$ELSE}MAX = 499*1000*1000;{$ENDIF}
type
tValue = LongWord;
tpValue = ^tValue;
tPower = array[0..31] of tValue;
tIndex = record
idxI,
idxS : tValue;
end;
tdpa = array[0..2] of LongWord;
var
power : tPower;
PowerFac : tPower;
DivSumField : array[0..MAX] of tValue;
Indices : array[0..511] of tIndex;
DpaCnt : tdpa;
procedure Init;
var
i : LongInt;
begin
DivSumField[0]:= 0;
For i := 1 to MAX do
DivSumField[i]:= 1;
end;
procedure ProperDivs(n: tValue);
//Only for output, normally a factorication would do
var
su,so : string;
i,q : tValue;
begin
su:= '1';
so:= '';
i := 2;
while i*i <= n do
begin
q := n div i;
IF q*i -n = 0 then
begin
su:= su+','+IntToStr(i);
IF q <> i then
so:= ','+IntToStr(q)+so;
end;
inc(i);
end;
writeln(' [',su+so,']');
end;
procedure AmPairOutput(cnt:tValue);
var
i : tValue;
r : double;
begin
r := 1.0;
For i := 0 to cnt-1 do
with Indices[i] do
begin
writeln(i+1:4,IdxI:12,IDxS:12,' ratio ',IdxS/IDxI:10:7);
if r < IdxS/IDxI then
r := IdxS/IDxI;
IF cnt < 20 then
begin
ProperDivs(IdxI);
ProperDivs(IdxS);
end;
end;
writeln(' max ratio ',r:10:4);
end;
function Check:tValue;
var
i,s,n : tValue;
begin
fillchar(DpaCnt,SizeOf(dpaCnt),#0);
n := 0;
For i := 1 to MAX do
begin
//s = sum of proper divs (I) == sum of divs (I) - I
s := DivSumField[i]-i;
IF (s <=MAX) AND (s>i) then
begin
IF DivSumField[s]-s = i then
begin
With indices[n] do
begin
idxI := i;
idxS := s;
end;
inc(n);
end;
end;
inc(DpaCnt[Ord(s>=i)-Ord(s<=i)+1]);
end;
result := n;
end;
Procedure CalcPotfactor(prim:tValue);
//PowerFac[k] = (prim^(k+1)-1)/(prim-1) == Sum (i=1..k) prim^i
var
k: tValue;
Pot, //== prim^k
PFac : Int64;
begin
Pot := prim;
PFac := 1;
For k := 0 to High(PowerFac) do
begin
PFac := PFac+Pot;
IF (POT > MAX) then
BREAK;
PowerFac[k] := PFac;
Pot := Pot*prim;
end;
end;
procedure InitPW(prim:tValue);
begin
fillchar(power,SizeOf(power),#0);
CalcPotfactor(prim);
end;
function NextPotCnt(p: tValue):tValue;inline;
//return the first power <> 0
//power == n to base prim
var
i : tValue;
begin
result := 0;
repeat
i := power[result];
Inc(i);
IF i < p then
BREAK
else
begin
i := 0;
power[result] := 0;
inc(result);
end;
until false;
power[result] := i;
end;
function Sieve(prim: tValue):tValue;
//simple version
var
actNumber : tValue;
begin
while prim <= MAX do
begin
InitPW(prim);
//actNumber = actual number = n*prim
//power == n to base prim
actNumber := prim;
while actNumber < MAX do
begin
DivSumField[actNumber] := DivSumField[actNumber] *PowerFac[NextPotCnt(prim)];
inc(actNumber,prim);
end;
//next prime
repeat
inc(prim);
until (DivSumField[prim] = 1);
end;
result := prim;
end;
var
T2,T1,T0: TDatetime;
APcnt: tValue;
begin
T0:= time;
Init;
Sieve(2);
T1:= time;
APCnt := Check;
T2:= time;
AmPairOutput(APCnt);
writeln(DpaCnt[0]:10,' deficient');
writeln(DpaCnt[1]:10,' perfect');
writeln(DpaCnt[2]:10,' abundant');
writeln(DpaCnt[2]/DpaCnt[0]:14:10,' ratio abundant/deficient ');
writeln('Time to calc sum of divs ',FormatDateTime('HH:NN:SS.ZZZ' ,T1-T0));
writeln('Time to find amicable pairs ',FormatDateTime('HH:NN:SS.ZZZ' ,T2-T1));
{$IFNDEF UNIX}
readln;
{$ENDIF}
end.