Submission #3787948
Source Code Expand
#include<cstdio> typedef long long ll; const ll mod=998244353; inline ll rev(ll x) {ll k=mod-2,r=1;for(;k;k>>=1,(x*=x)%=mod)if(k&1)(r*=x)%=mod;return r;} ll fac[1111111],inv[1111111]; inline ll C(int n,int r) {return((((fac[n]*inv[r])%mod)*inv[n-r])%mod);} int main() { int n,m; scanf("%d%d",&n,&m); if(n<m)n^=m,m^=n,n^=m; fac[0]=inv[0]=1; register int i; for(i=1;i<=n+m;i++)fac[i]=(fac[i-1]*i)%mod; inv[n+m]=rev(fac[n+m]); for(i=n+m-1;i;i--)inv[i]=inv[i+1]*(i+1)%mod; ll ans=0; for(i=1;i<=m;i++) (ans+=C(i*2,i)*C(n+m-2*i,n-i))%=mod; (((ans*=rev(2*C(n+m,n)))%=mod)+=n+mod)%=mod; printf("%lld\n",ans); }
Submission Info
Submission Time | |
---|---|
Task | F - Yes or No |
User | luogu_bot2 |
Language | C++ (GCC 5.4.1) |
Score | 2000 |
Code Size | 639 Byte |
Status | AC |
Exec Time | 19 ms |
Memory | 16640 KB |
Compile Error
./Main.cpp: In function ‘int main()’: ./Main.cpp:12:21: 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 | 2304 KB |
subtask_1_13.txt | AC | 1 ms | 2304 KB |
subtask_1_14.txt | AC | 2 ms | 2688 KB |
subtask_1_15.txt | AC | 5 ms | 5760 KB |
subtask_1_16.txt | AC | 5 ms | 5760 KB |
subtask_1_17.txt | AC | 5 ms | 5760 KB |
subtask_1_18.txt | AC | 5 ms | 5760 KB |
subtask_1_19.txt | AC | 5 ms | 5760 KB |
subtask_1_20.txt | AC | 5 ms | 5760 KB |
subtask_1_21.txt | AC | 5 ms | 5760 KB |
subtask_1_22.txt | AC | 5 ms | 5760 KB |
subtask_1_23.txt | AC | 4 ms | 3712 KB |
subtask_1_24.txt | AC | 4 ms | 3584 KB |
subtask_1_25.txt | AC | 4 ms | 3584 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 | 19 ms | 16640 KB |
subtask_2_05.txt | AC | 19 ms | 16640 KB |
subtask_2_06.txt | AC | 19 ms | 16640 KB |
subtask_2_07.txt | AC | 19 ms | 16640 KB |
subtask_2_08.txt | AC | 19 ms | 16640 KB |
subtask_2_09.txt | AC | 19 ms | 16640 KB |
subtask_2_10.txt | AC | 19 ms | 16640 KB |
subtask_2_11.txt | AC | 19 ms | 16640 KB |
subtask_2_12.txt | AC | 19 ms | 16640 KB |
subtask_2_13.txt | AC | 19 ms | 16640 KB |
subtask_2_14.txt | AC | 19 ms | 16640 KB |
subtask_2_15.txt | AC | 19 ms | 16640 KB |
subtask_2_16.txt | AC | 19 ms | 16640 KB |
subtask_2_17.txt | AC | 19 ms | 16512 KB |
subtask_2_18.txt | AC | 18 ms | 16512 KB |
subtask_2_19.txt | AC | 15 ms | 14464 KB |
subtask_2_20.txt | AC | 8 ms | 10368 KB |
subtask_2_21.txt | AC | 8 ms | 10368 KB |
subtask_2_22.txt | AC | 8 ms | 10368 KB |
subtask_2_23.txt | AC | 8 ms | 10368 KB |
subtask_2_24.txt | AC | 8 ms | 10368 KB |
subtask_2_25.txt | AC | 8 ms | 10368 KB |
subtask_2_26.txt | AC | 8 ms | 10368 KB |
subtask_2_27.txt | AC | 8 ms | 10368 KB |
subtask_2_28.txt | AC | 8 ms | 10368 KB |
subtask_2_29.txt | AC | 9 ms | 10368 KB |
subtask_2_30.txt | AC | 10 ms | 12416 KB |
subtask_2_31.txt | AC | 12 ms | 12416 KB |
subtask_2_32.txt | AC | 19 ms | 16640 KB |
subtask_2_33.txt | AC | 19 ms | 16640 KB |
subtask_2_34.txt | AC | 19 ms | 16640 KB |
subtask_2_35.txt | AC | 18 ms | 16640 KB |
subtask_2_36.txt | AC | 18 ms | 16512 KB |
subtask_2_37.txt | AC | 10 ms | 10368 KB |
subtask_2_38.txt | AC | 7 ms | 8320 KB |
subtask_2_39.txt | AC | 18 ms | 16512 KB |
subtask_2_40.txt | AC | 10 ms | 12416 KB |