Submission #19872

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
19872	2016-02-25 06:29:31	gs13068	팔찌 (kriii4_V)	C++98	100 / 100	932 ms	12800 KiB

V

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#include <cstdio>
const int p = 1000000007;
int pw(int x, int y)
{
  return y & 1 ? (long long)pw(x, y ^ 1)*x%p : y ? pw((long long)x*x%p, y >> 1) : 1;
}
int a[1000001];
int c[1000001];
int d[1000001];
int main()
{
  int i, j, t1, t2, n, m, r = 0;
  scanf("%d%d", &n, &m);
  for (i = 1; i <= n; i++)
  {
    t1 = (a[i] + pw(m, i)) % p;
    for (j = i; j <= n; j += i)
    {
      a[j] = (a[j] + p - t1) % p;
      d[j] = (d[j] + (long long)t1*(j / i)) % p;
    }
  }
  r = 2;
  for (i = 1; i <= n; i++)
  {
    d[i] = (long long)d[i] * pw(i, p - 2) % p;
 
 
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• Subtask 1: 6 / 6
• Subtask 2: 94 / 94