首先要排序;
然后压缩;
最后东归;
搞定s=t;
ac;
program qingwa;
var
a:array[-1000..101000] of longint;
f,r:array[-1000..1000000] of longint;
i,j,k,m,n,s,t,l,min,temp:longint;
procedure quick(h,t:longint);
var
i,j,k,s:longint;
begin
i:=h;
j:=t;
k:=a[(i+j) div 2];
repeat
while a[i]<k do inc(i);
while a[j]>k do dec(j);
if i<=j then begin
s:=a[i]; a[i]:=a[j]; a[j]:=s;
inc(i); dec(j);
end;
until i>j;
if i<t then quick(i,t);
if h<j then quick(h,j);
end;
begin
readln(l);
readln(s,t,m);
fillchar(f,sizeof(f),0);
a[0]:=0;
a[m+1]:=l;
for i:=1 to m do
read(a[i]);
quick(1,m);
if s=t then begin
min:=0;
for i:=1 to m do
if a[i] mod s=0 then
inc(min);
writeln(min);
halt;
end;
for i:=0 to m do begin
if a[i+1]-a[i]>temp+100 then
inc(temp,a[i+1]-a[i]-temp-100);
dec(a[i+1],temp);
end;
for I:=1 to m do
r[a[i]]:=1;
l:=a[m+1];
for i:=1 to l do
begin
min:=maxint;
for j:=s to t do
begin
if i>=j then
if r[i]+f[i-j]<min then
min:=r[i]+f[i-j];
f[i]:=min;
end;
end;
writeln(f[l]);
end.
if a[i+1]-a[i]>temp+100 then
inc(temp,a[i+1]-a[i]-temp-100);
dec(a[i+1],temp);
end;
什么意思????