Submission #9137

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
9137	2014-09-27 14:09:20	ainta	Actual visible points (kriii2_AC)	C++98	4 / 4	208 ms	6292 KiB

AC

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#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, invF[201000];
bool chk[101000];
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] * invF[n] % Mod * invF[a - 1] % Mod;
}
void Do(int a){
  G[a] = (G[a] + Gap(a) - Gap(a-1) + Mod) % Mod;
  int i, ck = chk[a];
  for (i = a * 2; i <= 100000; i += a){
    G[i] = (G[i] + Mod - G[a]) % Mod;
    if (chk[i])ck = true;
  }
  if (ck)Res = (Res + G[a]) % Mod;
 
 
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• Subtask 1: 1 / 1
• Subtask 2: 3 / 3