Submission #4566191
Source Code Expand
#include <cstdio> const int N=500005,Mod=998244353; int fac[N],inv[N]; inline int qpow(int a,int b){ int ans=1; while (b){ if (b&1) ans=(1ll*ans*a)%Mod; a=(1ll*a*a)%Mod,b>>=1; } return ans; } inline int Min(int a,int b){ return a<b?a:b; } inline int Max(int a,int b){ return a>b?a:b; } inline int C(int n,int m){ return 1ll*fac[n]*inv[m]%Mod*inv[n-m]%Mod; } int main (){ int n,m;scanf ("%d%d",&n,&m); fac[0]=1; for (int i=1;i<=n+m;i++) fac[i]=1ll*fac[i-1]*i%Mod; inv[n+m]=qpow(fac[n+m],Mod-2); for (int i=n+m-1;i>=0;i--) inv[i]=1ll*inv[i+1]*(i+1)%Mod; int t=Min(n,m),ans=0; for (int i=1;i<=t;i++) ans=(1ll*ans+1ll*C(i*2,i)*C(n+m-2*i,n-i))%Mod; ans=1ll*ans*qpow(2,Mod-2)%Mod*qpow(C(n+m,n),Mod-2)%Mod; printf ("%d",(ans+Max(n,m))%Mod); return 0; }
Submission Info
Submission Time | |
---|---|
Task | F - Yes or No |
User | luogu_bot2 |
Language | C++14 (GCC 5.4.1) |
Score | 1500 |
Code Size | 797 Byte |
Status | RE |
Exec Time | 106 ms |
Memory | 4096 KB |
Compile Error
./Main.cpp: In function ‘int main()’: ./Main.cpp:22:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int n,m;scanf ("%d%d",&n,&m); ^
Judge Result
Set Name | Sample | Partial | All | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Score / Max Score | 0 / 0 | 1500 / 1500 | 0 / 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 | 128 KB |
sample_02.txt | AC | 1 ms | 128 KB |
sample_03.txt | AC | 1 ms | 128 KB |
sample_04.txt | AC | 1 ms | 128 KB |
sample_05.txt | AC | 1 ms | 128 KB |
subtask_1_01.txt | AC | 1 ms | 128 KB |
subtask_1_02.txt | AC | 1 ms | 128 KB |
subtask_1_03.txt | AC | 1 ms | 128 KB |
subtask_1_04.txt | AC | 1 ms | 128 KB |
subtask_1_05.txt | AC | 1 ms | 128 KB |
subtask_1_06.txt | AC | 1 ms | 128 KB |
subtask_1_07.txt | AC | 1 ms | 128 KB |
subtask_1_08.txt | AC | 1 ms | 128 KB |
subtask_1_09.txt | AC | 1 ms | 128 KB |
subtask_1_10.txt | AC | 1 ms | 128 KB |
subtask_1_11.txt | AC | 1 ms | 128 KB |
subtask_1_12.txt | AC | 1 ms | 256 KB |
subtask_1_13.txt | AC | 1 ms | 256 KB |
subtask_1_14.txt | AC | 2 ms | 640 KB |
subtask_1_15.txt | AC | 4 ms | 1664 KB |
subtask_1_16.txt | AC | 4 ms | 1664 KB |
subtask_1_17.txt | AC | 4 ms | 1664 KB |
subtask_1_18.txt | AC | 4 ms | 1664 KB |
subtask_1_19.txt | AC | 4 ms | 1664 KB |
subtask_1_20.txt | AC | 4 ms | 1664 KB |
subtask_1_21.txt | AC | 4 ms | 1664 KB |
subtask_1_22.txt | AC | 4 ms | 1664 KB |
subtask_1_23.txt | AC | 4 ms | 1664 KB |
subtask_1_24.txt | AC | 4 ms | 1536 KB |
subtask_1_25.txt | AC | 4 ms | 1536 KB |
subtask_2_01.txt | AC | 1 ms | 128 KB |
subtask_2_02.txt | AC | 1 ms | 128 KB |
subtask_2_03.txt | AC | 1 ms | 128 KB |
subtask_2_04.txt | RE | 104 ms | 2048 KB |
subtask_2_05.txt | RE | 102 ms | 2048 KB |
subtask_2_06.txt | RE | 102 ms | 2048 KB |
subtask_2_07.txt | RE | 104 ms | 2048 KB |
subtask_2_08.txt | RE | 103 ms | 2048 KB |
subtask_2_09.txt | RE | 102 ms | 2048 KB |
subtask_2_10.txt | RE | 105 ms | 2048 KB |
subtask_2_11.txt | RE | 106 ms | 2048 KB |
subtask_2_12.txt | RE | 104 ms | 2048 KB |
subtask_2_13.txt | RE | 103 ms | 2048 KB |
subtask_2_14.txt | RE | 103 ms | 2048 KB |
subtask_2_15.txt | RE | 103 ms | 2048 KB |
subtask_2_16.txt | RE | 105 ms | 2048 KB |
subtask_2_17.txt | RE | 103 ms | 2048 KB |
subtask_2_18.txt | RE | 103 ms | 2048 KB |
subtask_2_19.txt | RE | 103 ms | 2048 KB |
subtask_2_20.txt | AC | 8 ms | 4096 KB |
subtask_2_21.txt | AC | 8 ms | 4096 KB |
subtask_2_22.txt | WA | 8 ms | 4096 KB |
subtask_2_23.txt | WA | 8 ms | 4096 KB |
subtask_2_24.txt | WA | 8 ms | 4096 KB |
subtask_2_25.txt | WA | 8 ms | 4096 KB |
subtask_2_26.txt | RE | 104 ms | 2048 KB |
subtask_2_27.txt | RE | 102 ms | 2048 KB |
subtask_2_28.txt | RE | 103 ms | 2048 KB |
subtask_2_29.txt | RE | 103 ms | 2048 KB |
subtask_2_30.txt | RE | 103 ms | 2048 KB |
subtask_2_31.txt | RE | 102 ms | 2048 KB |
subtask_2_32.txt | RE | 102 ms | 2048 KB |
subtask_2_33.txt | RE | 102 ms | 2048 KB |
subtask_2_34.txt | RE | 103 ms | 2048 KB |
subtask_2_35.txt | RE | 103 ms | 2048 KB |
subtask_2_36.txt | RE | 103 ms | 2048 KB |
subtask_2_37.txt | AC | 9 ms | 3968 KB |
subtask_2_38.txt | AC | 7 ms | 3328 KB |
subtask_2_39.txt | RE | 102 ms | 2048 KB |
subtask_2_40.txt | RE | 102 ms | 2048 KB |