QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#762403 | #8023. The Journey of Geor Autumn | cppcppcpp3 | AC ✓ | 177ms | 120848kb | C++14 | 1.3kb | 2024-11-19 14:53:41 | 2024-11-19 14:53:43 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
const int N=1e7+5;
const int mod=998244353;
static char buf[1000000],*p1=buf,*p2=buf;
#define getchar() p1==p2&&(p2=(p1=buf)+fread(buf,1,1000000,stdin),p1==p2)?EOF:*p1++
inline int wrd(){int x=0,f=1;char c=getchar();while(c<'0' || c>'9'){if(c=='-') f=-1;c=getchar();}while(c>='0' && c<='9') {x=(x<<3)+(x<<1)+c-48;c=getchar();}return x*f;}
inline void write(int x){static char buf[20];static int len=-1;if(x<0)putchar('-'),x=-x;do buf[++len]=x%10,x/=10;while(x);while(len>=0)putchar(buf[len--]+48);}
int n,m,as,fac[N],inv[N];
int qpw(int a,int b){
int as=1;
while(b){
if(b&1) as=1ll*as*a%mod;
a=1ll*a*a%mod,b>>=1;
}
return as;
}
void ad(int &a,int b){(a+=b)>=mod&&(a-=mod);}
void init(int n){
fac[0]=1; for(int i=1;i<=n;++i) fac[i]=1ll*fac[i-1]*i%mod;
inv[n]=qpw(fac[n],mod-2); for(int i=n;i;--i) inv[i-1]=1ll*inv[i]*i%mod;
}
int C(int n,int m){
if(n<m || m<0) return 0;
return 1ll*fac[n]*inv[m]%mod*inv[n-m]%mod;
}
int dp[N];
signed main(){
cin.tie(nullptr)->sync_with_stdio(false);
cin>>n>>m,init(n);
dp[0]=1;
int sm(dp[0]*fac[n-0-1]);
for(int i=1;i<=n;++i){
dp[i]=1ll*sm*inv[n-i]%mod;
ad(sm,1ll*dp[i]*fac[n-i-1]%mod);
if(i>=m) ad(sm,mod-1ll*dp[i-m]*fac[n-(i-m)-1]%mod);
}
cout<<dp[n];
}
这程序好像有点Bug,我给组数据试试?
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 1ms
memory: 7816kb
input:
1 1
output:
1
result:
ok "1"
Test #2:
score: 0
Accepted
time: 0ms
memory: 7772kb
input:
1 2
output:
1
result:
ok "1"
Test #3:
score: 0
Accepted
time: 1ms
memory: 7776kb
input:
1 3
output:
1
result:
ok "1"
Test #4:
score: 0
Accepted
time: 1ms
memory: 7756kb
input:
1 4
output:
1
result:
ok "1"
Test #5:
score: 0
Accepted
time: 0ms
memory: 7776kb
input:
2 1
output:
1
result:
ok "1"
Test #6:
score: 0
Accepted
time: 1ms
memory: 7756kb
input:
2 2
output:
2
result:
ok "2"
Test #7:
score: 0
Accepted
time: 1ms
memory: 7816kb
input:
2 3
output:
2
result:
ok "2"
Test #8:
score: 0
Accepted
time: 1ms
memory: 7752kb
input:
2 4
output:
2
result:
ok "2"
Test #9:
score: 0
Accepted
time: 1ms
memory: 7632kb
input:
3 1
output:
1
result:
ok "1"
Test #10:
score: 0
Accepted
time: 1ms
memory: 7756kb
input:
3 2
output:
4
result:
ok "4"
Test #11:
score: 0
Accepted
time: 1ms
memory: 7776kb
input:
3 3
output:
6
result:
ok "6"
Test #12:
score: 0
Accepted
time: 1ms
memory: 7764kb
input:
3 4
output:
6
result:
ok "6"
Test #13:
score: 0
Accepted
time: 1ms
memory: 7688kb
input:
4 1
output:
1
result:
ok "1"
Test #14:
score: 0
Accepted
time: 1ms
memory: 7752kb
input:
4 2
output:
10
result:
ok "10"
Test #15:
score: 0
Accepted
time: 1ms
memory: 7832kb
input:
4 3
output:
18
result:
ok "18"
Test #16:
score: 0
Accepted
time: 1ms
memory: 7704kb
input:
4 4
output:
24
result:
ok "24"
Test #17:
score: 0
Accepted
time: 1ms
memory: 7700kb
input:
99 50
output:
955866606
result:
ok "955866606"
Test #18:
score: 0
Accepted
time: 1ms
memory: 7748kb
input:
99 70
output:
296999003
result:
ok "296999003"
Test #19:
score: 0
Accepted
time: 0ms
memory: 7704kb
input:
1034 998
output:
637688669
result:
ok "637688669"
Test #20:
score: 0
Accepted
time: 0ms
memory: 7744kb
input:
1099 997
output:
712935289
result:
ok "712935289"
Test #21:
score: 0
Accepted
time: 0ms
memory: 7744kb
input:
10314 998
output:
224695890
result:
ok "224695890"
Test #22:
score: 0
Accepted
time: 1ms
memory: 7800kb
input:
10929 9974
output:
160291286
result:
ok "160291286"
Test #23:
score: 0
Accepted
time: 0ms
memory: 12256kb
input:
103124 99448
output:
695932649
result:
ok "695932649"
Test #24:
score: 0
Accepted
time: 0ms
memory: 12216kb
input:
109139 9937
output:
268916696
result:
ok "268916696"
Test #25:
score: 0
Accepted
time: 17ms
memory: 18040kb
input:
1031234 99238
output:
441457721
result:
ok "441457721"
Test #26:
score: 0
Accepted
time: 14ms
memory: 20972kb
input:
1091239 991237
output:
61047495
result:
ok "61047495"
Test #27:
score: 0
Accepted
time: 177ms
memory: 120848kb
input:
10000000 9982443
output:
224744113
result:
ok "224744113"
Test #28:
score: 0
Accepted
time: 172ms
memory: 120776kb
input:
9999977 5678901
output:
641748125
result:
ok "641748125"
Extra Test:
score: 0
Extra Test Passed