CSES - HIIT Open 2019 - Results
Test results
testverdicttime
#1ACCEPTED0.02 sdetails
#2ACCEPTED0.03 sdetails
#3ACCEPTED0.02 sdetails
#4ACCEPTED0.02 sdetails
#5ACCEPTED0.02 sdetails
#6ACCEPTED0.02 sdetails
#7ACCEPTED0.02 sdetails
#8ACCEPTED0.02 sdetails
#9ACCEPTED0.02 sdetails
#10ACCEPTED0.03 sdetails
#110.04 sdetails
#12ACCEPTED0.01 sdetails
#130.05 sdetails
#140.05 sdetails
#15ACCEPTED0.05 sdetails
#160.03 sdetails
#170.04 sdetails
#180.04 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 n, k, d[1010101][2], cntt;

void haku(int len, string s) {
if(len == n) {
char ed = 'G';
int cnt = 0;
for(auto u:s) {
if(u == ed) {
cnt++;
} else {
cnt = 1;
ed = u;
}
if(cnt == k && ed == '0')
return;
}
cout << s<<endl;
cntt++;
}
else {
haku(len+1, s+"1");
haku(len+1, s+"0");
}
}

int main() {
cin.tie(0);
cout.tie(0);
ios_base::sync_with_stdio(0);
cin >> n >> k;
if(k == 1) {
cout << 1;
exit(0);
} else {

}
d[0][0] = 1;
d[0][1] = (k==1)?0:1;
d[1][0] = 1;
d[1][1] = (k==1)?0:1;
for(int i=2; i<=n; i++) {
d[i][0] = d[i-1][0]+d[i-1][1];
d[i][1] = d[i-1][0]+d[i-1][1];
d[i][0] %= M;
d[i][1] %= M;
if(i-k>=0)
d[i][0] -= d[i-k][1];
d[i][0] %= M;
d[i][1] %= M;
}
cout << d[n][1]+d[n][0];
}

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

Verdict:

input
654321 123456

correct output
796245691

user output
-203754316

Test 12

Verdict: ACCEPTED

input
1000000 1

correct output
1

user output
1

Verdict:

input
1000000 10

correct output
256933600

user output
-743066407

Verdict:

input
1000000 100

correct output
142013415

user output
-857986592

Test 15

Verdict: ACCEPTED

input
1000000 1000

correct output
899626120

user output
899626120

Verdict:

input
1000000 10000

correct output
374265948

user output
-625734059

Verdict:

input
1000000 100000

correct output
388134512

user output
-611865495

Verdict:

input
1000000 1000000

correct output
235042058

user output
1235042065