| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 19699 |
2016-02-25T04:41:40 Z |
csehydrogen |
괄호 (kriii4_R) |
C++ |
|
402 ms |
1084 KB |
#include <cstdio>
typedef long long ll;
int const MOD = 1000000007;
int pow(int x, int y) {
if (y == 1) return x;
int ret = pow(x, y / 2);
ret = (ll)ret * ret % MOD;
if (y & 1)
ret = (ll)ret * x % MOD;
return ret;
}
int inv(int x) {
return pow(x, MOD - 2);
}
int mul(int x, int y) {
return (ll)x * y % MOD;
}
int add(int x, int y) {
return (x + y) % MOD;
}
int main() {
int n, k;
scanf("%d%d", &n, &k);
int m = (n + 1) / 2;
int z = 1, ans = 0, pk = 1;
for (int i = n; i > n - m; --i) {
z = mul(z, i);
}
for (int i = 1; i <= m; ++i) {
z = mul(z, inv(i));
pk = mul(pk, k);
}
for (int i = m + 1; i <= n; ++i) {
int znext = z;
znext = mul(znext, inv(i));
znext = mul(znext, n - i + 1);
ans = add(ans, mul((z - znext + MOD) % MOD, pk));
z = znext;
pk = mul(pk, k);
}
ans = add(ans, mul(z, pk));
printf("%d", ans);
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
122 ms |
1084 KB |
Output is correct |
| 2 |
Correct |
25 ms |
1084 KB |
Output is correct |
| 3 |
Correct |
296 ms |
1084 KB |
Output is correct |
| 4 |
Correct |
330 ms |
1084 KB |
Output is correct |
| 5 |
Correct |
337 ms |
1084 KB |
Output is correct |
| 6 |
Correct |
187 ms |
1084 KB |
Output is correct |
| 7 |
Correct |
210 ms |
1084 KB |
Output is correct |
| 8 |
Correct |
141 ms |
1084 KB |
Output is correct |
| 9 |
Correct |
58 ms |
1084 KB |
Output is correct |
| 10 |
Correct |
14 ms |
1084 KB |
Output is correct |
| 11 |
Correct |
15 ms |
1084 KB |
Output is correct |
| 12 |
Correct |
298 ms |
1084 KB |
Output is correct |
| 13 |
Correct |
286 ms |
1084 KB |
Output is correct |
| 14 |
Correct |
124 ms |
1084 KB |
Output is correct |
| 15 |
Correct |
133 ms |
1084 KB |
Output is correct |
| 16 |
Correct |
121 ms |
1084 KB |
Output is correct |
| 17 |
Correct |
368 ms |
1084 KB |
Output is correct |
| 18 |
Correct |
380 ms |
1084 KB |
Output is correct |
| 19 |
Correct |
402 ms |
1084 KB |
Output is correct |
| 20 |
Correct |
401 ms |
1084 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
109 ms |
1084 KB |
Output is correct |
| 2 |
Correct |
35 ms |
1084 KB |
Output is correct |
| 3 |
Correct |
72 ms |
1084 KB |
Output is correct |
| 4 |
Correct |
363 ms |
1084 KB |
Output is correct |
| 5 |
Correct |
227 ms |
1084 KB |
Output is correct |
| 6 |
Correct |
281 ms |
1084 KB |
Output is correct |
| 7 |
Correct |
194 ms |
1084 KB |
Output is correct |
| 8 |
Correct |
110 ms |
1084 KB |
Output is correct |
| 9 |
Correct |
191 ms |
1084 KB |
Output is correct |
| 10 |
Correct |
25 ms |
1084 KB |
Output is correct |
| 11 |
Correct |
316 ms |
1084 KB |
Output is correct |
| 12 |
Correct |
332 ms |
1084 KB |
Output is correct |
| 13 |
Correct |
314 ms |
1084 KB |
Output is correct |
| 14 |
Correct |
148 ms |
1084 KB |
Output is correct |
| 15 |
Correct |
184 ms |
1084 KB |
Output is correct |
| 16 |
Correct |
181 ms |
1084 KB |
Output is correct |
| 17 |
Correct |
31 ms |
1084 KB |
Output is correct |
| 18 |
Correct |
401 ms |
1084 KB |
Output is correct |
| 19 |
Correct |
401 ms |
1084 KB |
Output is correct |
| 20 |
Correct |
401 ms |
1084 KB |
Output is correct |
