Cod sursa(job #60705)
Utilizator | Sirbu Alexandru al3csutzu | Data | 15 mai 2007 23:39:44 |
---|---|---|---|
Problema | Medie | Scor | 0 |
Compilator | fpc | Status | done |
Runda | Arhiva de probleme | Marime | 0.5 kb |
program media;
var v,w:array[1..14000] of integer;
a:array[1..9000] of integer;
summax:longint;
f,g:text;
m,n,i,j,k:integer;
begin
assign(f,'medie.in'); assign(g,'medie.out'); reset(f); rewrite(g);
read(f,n);
m:=n;
j:=0;
for i:=1 to m do
begin
read(f,a[i]);
w[a[i]]:=w[a[i]]+1;
end;
summax:=0;
for i:=1 to n-1 do
for j:=i+1 to n do
v[a[i]+a[j] div 2]:=v[a[i]+a[j]]+1;
for i:=1 to n do
summax:=summax+v[a[i]*2]-w[a[i]]+1;
writeln(g,summax);
close(f); close(g);
end.