var j,k,n,m,s,t:longint;
a:string;
b:array[1..100000000]of longint;

begin

read(n);
s:=1;
for j:=1 to n do
begin
t:=j;
while t<>0 do
begin
b[s]:=j; s:=s+1;
t:=t-1;
end;
end;
for j:=1 to n do m:=m+b[j];
write(m);

end.

#include<iostream>
#include<cstdio>
using namespace std;
int main()
{

long long int a,b,c,e,f,g;
int d=0;
cin>>a;
while(1)

{
d++;
c=(d*(d+1))/2;
if(c>=a)
{break; }
}
d=d-1;
e=(2*a-d*(d+1))/2*(d+1);
f=d*(d+1)*(2*d+1)/6;
g=f+e;
cout<<g<<endl;
return 0;
}

无坑无难度~
代码呈上：
#include <iostream>
#include <cmath>
#include <cstring>

using namespace std;

main ()
{
long long int n; //保险起见~
long long int t;
long long int s;
cin>>n;
t=1;
s=0;
while(n>=t)
{
n-=t;
s+=t*t;
t++;
}
s+=n*t;
cout<<s;
}

近半年写过的唯一一个少于80行的程序

#include <stdio.h>
int main(){
int i, day, coin = 0;
scanf("%d", &day);
for(i=1; (1+i)*i/2<=day; i++)
coin += i*i;
coin += (day-i*(i-1)/2)*i;
printf("%d\n", coin);
return 0;
}

#include<iostream>
using namespace std;

int main(){
int k,ans=0,now=1,c1=0;
cin>>k;
for(int i=1;i<=k;i++){
ans+=now;
++c1;
if(now==c1) {
c1=0;
now++;
}
}
cout<<ans;
return 0;
}

真想回到普及组。。
模拟。。。。。。。
var
x,ans,n,i,m:longint;
begin
readln(n);
x:=0; i:=0; m:=1;
while x<n do
begin
ans:=ans+m;
inc(x);
inc(i);
if i=m then
begin
inc(m);
i:=0;
end;
end;
writeln(ans);
end.

为什么井号和星号发了显示不出来

**

#include<algorithm>
#include<cstring>
#include<iostream>
using namespace std;
//ifstream fin("coin.in");
//ofstream fout("coin.out");
int n,i=0,ct,net;

int main()
{
cin>>n;
while(n>0)
{
i++;
ct+=i*i;
n=n-i;
net=i;

}
if(n<0)
{
ct=ct-((0-n)*i);
}
cout<<ct;

return 0;
}

直接把考试的传上来了，^_^。

#include<algorithm>
#include<cstring>
#include<fstream>
using namespace std;
ifstream fin("coin.in");
ofstream fout("coin.out");
int n,i=0,ct,net;

int main()
{
fin>>n;
while(n>0)
{
i++;
ct+=i*i;
n=n-i;
net=i;

}
//fout<<ct;
if(n<0)
{
ct=ct-((0-n)*i);
}
fout<<ct;

return 0;
}

var
k,n,ans:longint;
begin
readln(k);
ans:=0;
n:=1;
while k>=n do
begin
ans:=ans+n*n;
k:=k-n;
inc(n);
end;
ans:=ans+k*n;
writeln(ans);
end.

#include <iostream>
using namespace std;

int main()
{
int i,j,sum=0,num=0,a=1,in;
cin>>in;
for(i=1;;i++)
{
for(j=1;j<=i;j++)
{
sum+=i;
num++;
if(num==in) {a=0;break;}
}
if(a==0) break;
}
cout<<sum;

return 0;
}