Submission #4564530
Source Code Expand
#include <cstdio> #include <algorithm> const int maxn = 1000005, P = 998244353; int n, m, fac[maxn], ifac[maxn]; int power(int a, int x) { int ans = 1; for (; x; x >>= 1, a = 1LL * a * a % P) if (x & 1) ans = 1LL * ans * a % P; return ans; } int binom(int n, int m) { if (n < m || m < 0) return 0; return 1LL * fac[n] * ifac[m] % P * ifac[n - m] % P; } int main() { scanf("%d%d", &n, &m); if (n < m) std::swap(n, m); fac[0] = 1; for (int i = 1; i <= n + m; ++i) fac[i] = 1LL * fac[i - 1] * i % P; ifac[n + m] = power(fac[n + m], P - 2); for (int i = n + m; i; --i) ifac[i - 1] = 1LL * ifac[i] * i % P; int ans = 0; for (int i = 1; i <= m; ++i) ans = (ans + 1LL * binom(2 * i, i) * binom(n + m - 2 * i, n - i)) % P; ans = 1LL * ans * power(2 * binom(n + m, n) % P, P - 2) % P; ans = (ans + n) % P; printf("%d\n", ans); return 0; }
Submission Info
Submission Time | |
---|---|
Task | F - Yes or No |
User | luogu_bot5 |
Language | C++14 (GCC 5.4.1) |
Score | 2000 |
Code Size | 865 Byte |
Status | AC |
Exec Time | 18 ms |
Memory | 7936 KB |
Compile Error
./Main.cpp: In function ‘int main()’: ./Main.cpp:24:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^
Judge Result
Set Name | Sample | Partial | All | ||||||
---|---|---|---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 1500 / 1500 | 500 / 500 | ||||||
Status |
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Set Name | Test Cases |
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Sample | sample_01.txt, sample_02.txt, sample_03.txt, sample_04.txt, sample_05.txt |
Partial | sample_01.txt, sample_02.txt, sample_04.txt, subtask_1_01.txt, subtask_1_02.txt, subtask_1_03.txt, subtask_1_04.txt, subtask_1_05.txt, subtask_1_06.txt, subtask_1_07.txt, subtask_1_08.txt, subtask_1_09.txt, subtask_1_10.txt, subtask_1_11.txt, subtask_1_12.txt, subtask_1_13.txt, subtask_1_14.txt, subtask_1_15.txt, subtask_1_16.txt, subtask_1_17.txt, subtask_1_18.txt, subtask_1_19.txt, subtask_1_20.txt, subtask_1_21.txt, subtask_1_22.txt, subtask_1_23.txt, subtask_1_24.txt, subtask_1_25.txt |
All | sample_01.txt, sample_02.txt, sample_03.txt, sample_04.txt, sample_05.txt, sample_01.txt, sample_02.txt, sample_03.txt, sample_04.txt, sample_05.txt, subtask_1_01.txt, subtask_1_02.txt, subtask_1_03.txt, subtask_1_04.txt, subtask_1_05.txt, subtask_1_06.txt, subtask_1_07.txt, subtask_1_08.txt, subtask_1_09.txt, subtask_1_10.txt, subtask_1_11.txt, subtask_1_12.txt, subtask_1_13.txt, subtask_1_14.txt, subtask_1_15.txt, subtask_1_16.txt, subtask_1_17.txt, subtask_1_18.txt, subtask_1_19.txt, subtask_1_20.txt, subtask_1_21.txt, subtask_1_22.txt, subtask_1_23.txt, subtask_1_24.txt, subtask_1_25.txt, subtask_2_01.txt, subtask_2_02.txt, subtask_2_03.txt, subtask_2_04.txt, subtask_2_05.txt, subtask_2_06.txt, subtask_2_07.txt, subtask_2_08.txt, subtask_2_09.txt, subtask_2_10.txt, subtask_2_11.txt, subtask_2_12.txt, subtask_2_13.txt, subtask_2_14.txt, subtask_2_15.txt, subtask_2_16.txt, subtask_2_17.txt, subtask_2_18.txt, subtask_2_19.txt, subtask_2_20.txt, subtask_2_21.txt, subtask_2_22.txt, subtask_2_23.txt, subtask_2_24.txt, subtask_2_25.txt, subtask_2_26.txt, subtask_2_27.txt, subtask_2_28.txt, subtask_2_29.txt, subtask_2_30.txt, subtask_2_31.txt, subtask_2_32.txt, subtask_2_33.txt, subtask_2_34.txt, subtask_2_35.txt, subtask_2_36.txt, subtask_2_37.txt, subtask_2_38.txt, subtask_2_39.txt, subtask_2_40.txt |
Case Name | Status | Exec Time | Memory |
---|---|---|---|
sample_01.txt | AC | 1 ms | 2176 KB |
sample_02.txt | AC | 1 ms | 2176 KB |
sample_03.txt | AC | 1 ms | 2176 KB |
sample_04.txt | AC | 1 ms | 2176 KB |
sample_05.txt | AC | 1 ms | 2176 KB |
subtask_1_01.txt | AC | 1 ms | 2176 KB |
subtask_1_02.txt | AC | 1 ms | 2176 KB |
subtask_1_03.txt | AC | 1 ms | 2176 KB |
subtask_1_04.txt | AC | 1 ms | 2176 KB |
subtask_1_05.txt | AC | 1 ms | 2176 KB |
subtask_1_06.txt | AC | 1 ms | 2176 KB |
subtask_1_07.txt | AC | 1 ms | 2176 KB |
subtask_1_08.txt | AC | 1 ms | 2176 KB |
subtask_1_09.txt | AC | 1 ms | 2176 KB |
subtask_1_10.txt | AC | 1 ms | 2176 KB |
subtask_1_11.txt | AC | 1 ms | 2176 KB |
subtask_1_12.txt | AC | 1 ms | 2176 KB |
subtask_1_13.txt | AC | 1 ms | 2304 KB |
subtask_1_14.txt | AC | 3 ms | 4480 KB |
subtask_1_15.txt | AC | 5 ms | 4992 KB |
subtask_1_16.txt | AC | 5 ms | 4992 KB |
subtask_1_17.txt | AC | 5 ms | 4992 KB |
subtask_1_18.txt | AC | 5 ms | 4992 KB |
subtask_1_19.txt | AC | 5 ms | 4992 KB |
subtask_1_20.txt | AC | 5 ms | 4992 KB |
subtask_1_21.txt | AC | 5 ms | 4992 KB |
subtask_1_22.txt | AC | 5 ms | 4992 KB |
subtask_1_23.txt | AC | 5 ms | 4992 KB |
subtask_1_24.txt | AC | 5 ms | 4992 KB |
subtask_1_25.txt | AC | 4 ms | 4992 KB |
subtask_2_01.txt | AC | 1 ms | 2176 KB |
subtask_2_02.txt | AC | 1 ms | 2176 KB |
subtask_2_03.txt | AC | 1 ms | 2176 KB |
subtask_2_04.txt | AC | 18 ms | 7936 KB |
subtask_2_05.txt | AC | 18 ms | 7936 KB |
subtask_2_06.txt | AC | 18 ms | 7936 KB |
subtask_2_07.txt | AC | 18 ms | 7936 KB |
subtask_2_08.txt | AC | 18 ms | 7936 KB |
subtask_2_09.txt | AC | 18 ms | 7936 KB |
subtask_2_10.txt | AC | 18 ms | 7936 KB |
subtask_2_11.txt | AC | 18 ms | 7936 KB |
subtask_2_12.txt | AC | 18 ms | 7936 KB |
subtask_2_13.txt | AC | 18 ms | 7936 KB |
subtask_2_14.txt | AC | 18 ms | 7936 KB |
subtask_2_15.txt | AC | 18 ms | 7936 KB |
subtask_2_16.txt | AC | 18 ms | 7936 KB |
subtask_2_17.txt | AC | 18 ms | 7936 KB |
subtask_2_18.txt | AC | 17 ms | 7680 KB |
subtask_2_19.txt | AC | 15 ms | 7168 KB |
subtask_2_20.txt | AC | 7 ms | 6272 KB |
subtask_2_21.txt | AC | 7 ms | 6272 KB |
subtask_2_22.txt | AC | 7 ms | 6272 KB |
subtask_2_23.txt | AC | 7 ms | 6272 KB |
subtask_2_24.txt | AC | 7 ms | 6272 KB |
subtask_2_25.txt | AC | 7 ms | 6272 KB |
subtask_2_26.txt | AC | 7 ms | 6272 KB |
subtask_2_27.txt | AC | 7 ms | 6272 KB |
subtask_2_28.txt | AC | 7 ms | 6272 KB |
subtask_2_29.txt | AC | 7 ms | 6272 KB |
subtask_2_30.txt | AC | 9 ms | 6400 KB |
subtask_2_31.txt | AC | 12 ms | 6784 KB |
subtask_2_32.txt | AC | 18 ms | 7936 KB |
subtask_2_33.txt | AC | 18 ms | 7936 KB |
subtask_2_34.txt | AC | 18 ms | 7936 KB |
subtask_2_35.txt | AC | 18 ms | 7936 KB |
subtask_2_36.txt | AC | 18 ms | 7936 KB |
subtask_2_37.txt | AC | 9 ms | 6144 KB |
subtask_2_38.txt | AC | 6 ms | 5888 KB |
subtask_2_39.txt | AC | 17 ms | 7808 KB |
subtask_2_40.txt | AC | 9 ms | 6400 KB |