Submission #21418

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
21418	2017-04-13T19:29:35 Z	gs14004	Actual visible points (kriii2_AC)	C++11	4 / 4	86 ms	6708 KB

AC

#include <bits/stdc++.h>
using namespace std;
typedef long long lint;
typedef pair<int, int> pi;
const int mod = 1e9 + 7;

lint ipow(lint x, lint p){
	lint ret = 1, piv = x % mod;
	while(p){
		if(p&1) ret *= piv;
		piv *= piv;
		ret %= mod;
		piv %= mod;
		p >>= 1;
	}
	return ret % mod;
}

lint fact[200005], invf[200005];

lint bino(int x, int y){
	return fact[x] * (invf[x-y] * invf[y] % mod) % mod;
}

int n, q, chk[100005];
lint dp[100005];
int mob[100005];

int main(){
	fact[0] = invf[0] = 1;
	for(int i=1; i<=200000; i++){
		fact[i] = fact[i-1] * i % mod;
		invf[i] = ipow(fact[i], mod-2);
	}
	cin >> n >> q;
	for(int i=0; i<q; i++){
		int x;
		scanf("%d",&x);
		chk[x] = 1;
	}
	for(int i=1; i<=100000; i++){
		dp[i] += bino(n + i - 2, n - 1);
		dp[i] %= mod;
		for(int j=2*i; j<=100000; j+=i){
			dp[j] += mod - dp[i];
		}
	}
	lint ret = 0;
	for(int i=1; i<=100000; i++){
		for(int j=i; j<=100000; j+=i){
			if(chk[j]){
				chk[i] = 1;
				break;
			}
		}
		if(chk[i]) ret += dp[i];
	}
	ret %= mod;
	cout << ret << endl;
}

Compilation message

AC.cpp: In function 'int main()':
AC.cpp:38:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d",&x);
                 ^

Subtask #1

1.0 / 1.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	43 ms	6708 KB	Output is correct
2	Correct	46 ms	6708 KB	Output is correct
3	Correct	43 ms	6708 KB	Output is correct
4	Correct	43 ms	6708 KB	Output is correct
5	Correct	49 ms	6708 KB	Output is correct
6	Correct	46 ms	6708 KB	Output is correct
7	Correct	46 ms	6708 KB	Output is correct
8	Correct	46 ms	6708 KB	Output is correct
9	Correct	46 ms	6708 KB	Output is correct
10	Correct	46 ms	6708 KB	Output is correct
11	Correct	43 ms	6708 KB	Output is correct
12	Correct	43 ms	6708 KB	Output is correct
13	Correct	56 ms	6708 KB	Output is correct
14	Correct	46 ms	6708 KB	Output is correct
15	Correct	46 ms	6708 KB	Output is correct
16	Correct	56 ms	6708 KB	Output is correct
17	Correct	56 ms	6708 KB	Output is correct
18	Correct	59 ms	6708 KB	Output is correct
19	Correct	46 ms	6708 KB	Output is correct
20	Correct	59 ms	6708 KB	Output is correct
21	Correct	59 ms	6708 KB	Output is correct
22	Correct	69 ms	6708 KB	Output is correct
23	Correct	46 ms	6708 KB	Output is correct
24	Correct	53 ms	6708 KB	Output is correct
25	Correct	43 ms	6708 KB	Output is correct
26	Correct	39 ms	6708 KB	Output is correct
27	Correct	43 ms	6708 KB	Output is correct
28	Correct	43 ms	6708 KB	Output is correct
29	Correct	46 ms	6708 KB	Output is correct
30	Correct	46 ms	6708 KB	Output is correct
31	Correct	86 ms	6708 KB	Output is correct
32	Correct	69 ms	6708 KB	Output is correct
33	Correct	53 ms	6708 KB	Output is correct
34	Correct	49 ms	6708 KB	Output is correct
35	Correct	59 ms	6708 KB	Output is correct
36	Correct	66 ms	6708 KB	Output is correct
37	Correct	69 ms	6708 KB	Output is correct
38	Correct	53 ms	6708 KB	Output is correct
39	Correct	49 ms	6708 KB	Output is correct
40	Correct	79 ms	6708 KB	Output is correct

Subtask #2

3.0 / 3.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	39 ms	6708 KB	Output is correct
2	Correct	43 ms	6708 KB	Output is correct
3	Correct	53 ms	6708 KB	Output is correct
4	Correct	63 ms	6708 KB	Output is correct
5	Correct	43 ms	6708 KB	Output is correct
6	Correct	43 ms	6708 KB	Output is correct
7	Correct	46 ms	6708 KB	Output is correct
8	Correct	56 ms	6708 KB	Output is correct
9	Correct	43 ms	6708 KB	Output is correct
10	Correct	43 ms	6708 KB	Output is correct
11	Correct	39 ms	6708 KB	Output is correct
12	Correct	39 ms	6708 KB	Output is correct
13	Correct	39 ms	6708 KB	Output is correct
14	Correct	43 ms	6708 KB	Output is correct
15	Correct	39 ms	6708 KB	Output is correct
16	Correct	46 ms	6708 KB	Output is correct
17	Correct	59 ms	6708 KB	Output is correct
18	Correct	46 ms	6708 KB	Output is correct
19	Correct	43 ms	6708 KB	Output is correct
20	Correct	43 ms	6708 KB	Output is correct
21	Correct	43 ms	6708 KB	Output is correct
22	Correct	53 ms	6708 KB	Output is correct
23	Correct	59 ms	6708 KB	Output is correct
24	Correct	46 ms	6708 KB	Output is correct
25	Correct	43 ms	6708 KB	Output is correct
26	Correct	49 ms	6708 KB	Output is correct
27	Correct	63 ms	6708 KB	Output is correct
28	Correct	53 ms	6708 KB	Output is correct
29	Correct	56 ms	6708 KB	Output is correct
30	Correct	43 ms	6708 KB	Output is correct
31	Correct	56 ms	6708 KB	Output is correct
32	Correct	56 ms	6708 KB	Output is correct
33	Correct	49 ms	6708 KB	Output is correct
34	Correct	43 ms	6708 KB	Output is correct
35	Correct	53 ms	6708 KB	Output is correct
36	Correct	49 ms	6708 KB	Output is correct
37	Correct	63 ms	6708 KB	Output is correct
38	Correct	56 ms	6708 KB	Output is correct
39	Correct	56 ms	6708 KB	Output is correct
40	Correct	46 ms	6708 KB	Output is correct