不知道该叫啥

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程序：

#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;

long long n,m,s[70000],t[70000],tj,mo=1000000007,ans=0,f[101][70000];

int main ()
{
	scanf("%lld%lld",&n,&m);
	for (int j=1,x;j<=m;j=x+1)
	{
		x=m/(m/j);
		t[++tj]=x-j+1;
	}
	for (int i=1;i<=tj;i++)
		s[i]=s[i-1]+t[i];
	for (int i=2;i<=n;i++)
	{
		for (int j=1,k=tj;j<=tj;j++,k--)
			f[i][j]=(f[i][j]+t[j]*s[k])%mo;
		for (int j=1;j<=tj;j++)
			s[j]=(s[j-1]+f[i][j])%mo;
	}
	for (int i=1;i<=tj;i++)
		ans=(ans+f[n][i])%mo;
	ans%=mo;
	printf("%lld",ans);
	return 0;
}