求大神指导，为什么才40

hzszchengzhekai @ 2017-09-03 18:27:28

var
  k,a,i,j,t,b:longint;
begin
  read(k);
  i:=1;
  a:=0;
  j:=0;
  t:=1;
  repeat
  a:=i*i+a;
  j:=j+t;
  inc(t);
  inc(i);
  until j>=k;
  b:=i*(j-k);
  a:=a-b;
  write(a);
end.

by 蒻得不行 @ 2017-09-03 19:36:43

c++路过。。

by huanglth @ 2017-09-16 14:49:00

var
 n,day,ans,now:longint;
begin
assign(input,'p2669.in'); reset(input);
assign(output,'p2669.out'); rewrite(output);
ans:=0; day:=1; now:=0;
readln(n);
while now<n do
 begin
  ans:=ans+day*day;
  now:=now+day;
  day:=day+1;
 end;
if now>n then ans:=ans-(now-n)*(day-1);
writeln(ans);
close(input);
close(output);
end.

by 夢·壹生所愛 @ 2017-10-05 19:36:49

#include<cstdio>
using namespace std;
int main()
{
    int n,cnt=0,s=0;
    scanf("%d",&n);
    for(int j=1;;j++)
    {
        for(int i=1;i<=j;i++)
        {
            s+=j;
            cnt++;
            if(cnt==n)
            {
                printf("%d",s);
                return 0;
            }
        }
    }
}