#pragma warning(disable:4996)
#include<stdio.h>
#include<algorithm>
using namespace std;
int n, m, w[101000];
long long Mod = 1000000007, F[201000], G[201000], Res;
long long Inv(long long a){
long long cnt = Mod - 2, r = 1;
while (cnt){
if (cnt % 2){
r = r*a%Mod;
}
cnt /= 2;
a = a*a%Mod;
}
return r;
}
long long Gap(int a){
if (a == 0)return 0;
return F[a + n - 1] * Inv(F[n]) % Mod * Inv(F[a - 1]) % Mod;
}
void Do(int a){
G[a] = (G[a] + Gap(a) - Gap(a-1) + Mod) % Mod;
Res = (Res + G[a]) % Mod;
int i;
for (i = a * 2; i <= 100000; i += a){
G[i] = (G[i] + Mod - G[a]) % Mod;
}
}
int main()
{
int i;
scanf("%d%d", &n, &m);
for (i = 1; i <= m; i++)scanf("%d", &w[i]);
sort(w + 1, w + m + 1);
F[0] = 1;
for (i = 1; i <= 200010; i++){
F[i] = F[i - 1] * i%Mod;
}
for (i = 1; i <= m; i++){
Do(w[i]);
}
printf("%lld\n", Res);
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
0 ms |
4620 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Halted |
0 ms |
0 KB |
- |
