CSES - HIIT Open 2019 - Results
Submission details
Task:Bit Strings
Sender:.*
Submission time:2019-05-25 14:04:34
Language:C++
Status:READY
Result:
Test results
testverdicttime
#1ACCEPTED0.02 sdetails
#2ACCEPTED0.02 sdetails
#3ACCEPTED0.03 sdetails
#4ACCEPTED0.03 sdetails
#5ACCEPTED0.02 sdetails
#6ACCEPTED0.02 sdetails
#7ACCEPTED0.03 sdetails
#8ACCEPTED0.03 sdetails
#9ACCEPTED0.02 sdetails
#10ACCEPTED0.02 sdetails
#110.02 sdetails
#12ACCEPTED0.03 sdetails
#13ACCEPTED0.07 sdetails
#14ACCEPTED0.57 sdetails
#150.02 sdetails
#160.02 sdetails
#170.02 sdetails
#180.02 sdetails

Code

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define ull unsigned long long
#define M 1000000007
#define N (1<<18)
#define P complex<long long>
#define X real()
#define Y imag()
 
using namespace std;

ll c[333][2], ans, n, k;

int main() {
	cin.tie(0);
	cout.tie(0);
	ios_base::sync_with_stdio(0);
	cin >> n >> k;
	c[0][0] = 1;
	for(int i=0; i<n; i++) {
		for(int j=0; j<k; j++) {
			c[0][1] += c[j][0];
			c[j+1][1] += c[j][0];
			c[0][0] %= M;
			c[j+1][1] %= M;
		}
		for(int j=0; j<k; j++) {
			c[j][0] = c[j][1];
			c[j][1] = 0;
		}
	}
	for(int j=0; j<k; j++) {
		ans += c[j][0];
		ans %= M;
	}
	cout << ans;
}

Test details

Test 1

Verdict: ACCEPTED

input
1 1

correct output
1

user output
1

Test 2

Verdict: ACCEPTED

input
2 1

correct output
1

user output
1

Test 3

Verdict: ACCEPTED

input
2 2

correct output
3

user output
3

Test 4

Verdict: ACCEPTED

input
3 1

correct output
1

user output
1

Test 5

Verdict: ACCEPTED

input
3 2

correct output
5

user output
5

Test 6

Verdict: ACCEPTED

input
3 3

correct output
7

user output
7

Test 7

Verdict: ACCEPTED

input
4 1

correct output
1

user output
1

Test 8

Verdict: ACCEPTED

input
4 2

correct output
8

user output
8

Test 9

Verdict: ACCEPTED

input
4 3

correct output
13

user output
13

Test 10

Verdict: ACCEPTED

input
4 4

correct output
15

user output
15

Test 11

Verdict:

input
654321 123456

correct output
796245691

user output
(empty)

Test 12

Verdict: ACCEPTED

input
1000000 1

correct output
1

user output
1

Test 13

Verdict: ACCEPTED

input
1000000 10

correct output
256933600

user output
256933600

Test 14

Verdict: ACCEPTED

input
1000000 100

correct output
142013415

user output
142013415

Test 15

Verdict:

input
1000000 1000

correct output
899626120

user output
(empty)

Test 16

Verdict:

input
1000000 10000

correct output
374265948

user output
(empty)

Test 17

Verdict:

input
1000000 100000

correct output
388134512

user output
(empty)

Test 18

Verdict:

input
1000000 1000000

correct output
235042058

user output
(empty)