題目鏈接
思路:通過排列組合找到最小的序列
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <set>
#include<iostream>
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define SIS std::ios::sync_with_stdio(false)
#define space putchar(' ')
#define enter putchar('\n')
typedef pair<int,int> PII;
const int mod=1e4+7;
const int N=2e6+10;
const int inf=0x7f7f7f7f;
ll gcd(ll a,ll b)
{
return b==0?a:gcd(b,a%b);
}
ll lcm(ll a,ll b)
{
return a*(b/gcd(a,b));
}
template <class T>
void read(T &x)
{
char c;
bool op = 0;
while(c = getchar(), c < '0' || c > '9')
if(c == '-')
op = 1;
x = c - '0';
while(c = getchar(), c >= '0' && c <= '9')
x = x * 10 + c - '0';
if(op)
x = -x;
}
template <class T>
void write(T x)
{
if(x < 0)
x = -x, putchar('-');
if(x >= 10)
write(x / 10);
putchar('0' + x % 10);
}int a[12];
int main()
{
SIS;
ll n;
string x="codeforces";
cin>>n;
for(int i=0;i<10;i++)
a[i]=1;
ll ans=1;
int cnt=0;
while(ans<n)
{
ans/=a[cnt];
a[cnt]++;
ans*=a[cnt];
cnt++;
if(cnt==10)cnt=0;
}
for(int i=0;i<10;i++)
{
for(int j=0;j<a[i];j++)
cout<<x[i];
}
return 0;
}