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| ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
|---|---|---|---|---|---|---|---|---|---|
| #22629 | #2142. Yurik and Woodwork Lesson | ezoilearner# | AC ✓ | 40ms | 3844kb | C++17 | 675b | 2022-03-10 14:19:09 | 2022-04-30 01:28:18 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N=100010,mod=998244353;
int n,m;
inline int add(int a,int b){return a+b>=mod?a+b-mod:a+b;}
inline int sub(int a,int b){return a-b<0?a-b+mod:a-b;}
inline int mul(int a,int b){return (ll)a*b%mod;}
int fpow(int a,int b){int bs=1;while(b){if(b&1)bs=mul(bs,a);a=mul(a,a);b>>=1;}return bs;}
inline int C(int n,int m){
int ans=1;
for(int i=1;i<=m;i++)ans=mul(ans,mul(n-i+1,fpow(i,mod-2)));
return ans;
}
inline int f(int x,int y){
if(x<0||y<0)return 0;
return C(x+y,x);
}
int main(){
scanf("%d%d",&n,&m);
printf("%d\n",sub(mul(f(n-1,m-1),f(n-1,m-1)),mul(f(n-2,m),f(n,m-2))));
}
详细
Test #1:
score: 100
Accepted
time: 1ms
memory: 3772kb
input:
2 2
output:
3
result:
ok 1 number(s): "3"
Test #2:
score: 0
Accepted
time: 3ms
memory: 3772kb
input:
2 4
output:
10
result:
ok 1 number(s): "10"
Test #3:
score: 0
Accepted
time: 3ms
memory: 3724kb
input:
100 100
output:
818380736
result:
ok 1 number(s): "818380736"
Test #4:
score: 0
Accepted
time: 3ms
memory: 3760kb
input:
1 1
output:
1
result:
ok 1 number(s): "1"
Test #5:
score: 0
Accepted
time: 3ms
memory: 3708kb
input:
1 2
output:
1
result:
ok 1 number(s): "1"
Test #6:
score: 0
Accepted
time: 3ms
memory: 3792kb
input:
1 3
output:
1
result:
ok 1 number(s): "1"
Test #7:
score: 0
Accepted
time: 3ms
memory: 3768kb
input:
1 4
output:
1
result:
ok 1 number(s): "1"
Test #8:
score: 0
Accepted
time: 1ms
memory: 3840kb
input:
1 5
output:
1
result:
ok 1 number(s): "1"
Test #9:
score: 0
Accepted
time: 1ms
memory: 3780kb
input:
2 1
output:
1
result:
ok 1 number(s): "1"
Test #10:
score: 0
Accepted
time: 3ms
memory: 3844kb
input:
2 2
output:
3
result:
ok 1 number(s): "3"
Test #11:
score: 0
Accepted
time: 0ms
memory: 3680kb
input:
2 3
output:
6
result:
ok 1 number(s): "6"
Test #12:
score: 0
Accepted
time: 3ms
memory: 3752kb
input:
2 4
output:
10
result:
ok 1 number(s): "10"
Test #13:
score: 0
Accepted
time: 3ms
memory: 3776kb
input:
2 5
output:
15
result:
ok 1 number(s): "15"
Test #14:
score: 0
Accepted
time: 3ms
memory: 3756kb
input:
3 1
output:
1
result:
ok 1 number(s): "1"
Test #15:
score: 0
Accepted
time: 0ms
memory: 3756kb
input:
3 2
output:
6
result:
ok 1 number(s): "6"
Test #16:
score: 0
Accepted
time: 0ms
memory: 3788kb
input:
3 3
output:
20
result:
ok 1 number(s): "20"
Test #17:
score: 0
Accepted
time: 3ms
memory: 3792kb
input:
3 4
output:
50
result:
ok 1 number(s): "50"
Test #18:
score: 0
Accepted
time: 2ms
memory: 3708kb
input:
3 5
output:
105
result:
ok 1 number(s): "105"
Test #19:
score: 0
Accepted
time: 3ms
memory: 3772kb
input:
4 1
output:
1
result:
ok 1 number(s): "1"
Test #20:
score: 0
Accepted
time: 3ms
memory: 3752kb
input:
4 2
output:
10
result:
ok 1 number(s): "10"
Test #21:
score: 0
Accepted
time: 2ms
memory: 3752kb
input:
4 3
output:
50
result:
ok 1 number(s): "50"
Test #22:
score: 0
Accepted
time: 3ms
memory: 3708kb
input:
4 4
output:
175
result:
ok 1 number(s): "175"
Test #23:
score: 0
Accepted
time: 2ms
memory: 3756kb
input:
4 5
output:
490
result:
ok 1 number(s): "490"
Test #24:
score: 0
Accepted
time: 2ms
memory: 3776kb
input:
5 1
output:
1
result:
ok 1 number(s): "1"
Test #25:
score: 0
Accepted
time: 2ms
memory: 3840kb
input:
5 2
output:
15
result:
ok 1 number(s): "15"
Test #26:
score: 0
Accepted
time: 2ms
memory: 3800kb
input:
5 3
output:
105
result:
ok 1 number(s): "105"
Test #27:
score: 0
Accepted
time: 3ms
memory: 3684kb
input:
5 4
output:
490
result:
ok 1 number(s): "490"
Test #28:
score: 0
Accepted
time: 3ms
memory: 3636kb
input:
5 5
output:
1764
result:
ok 1 number(s): "1764"
Test #29:
score: 0
Accepted
time: 1ms
memory: 3772kb
input:
1 9
output:
1
result:
ok 1 number(s): "1"
Test #30:
score: 0
Accepted
time: 2ms
memory: 3756kb
input:
8 4
output:
4950
result:
ok 1 number(s): "4950"
Test #31:
score: 0
Accepted
time: 0ms
memory: 3772kb
input:
2 48
output:
1176
result:
ok 1 number(s): "1176"
Test #32:
score: 0
Accepted
time: 3ms
memory: 3640kb
input:
57 4
output:
278114495
result:
ok 1 number(s): "278114495"
Test #33:
score: 0
Accepted
time: 0ms
memory: 3772kb
input:
82 51
output:
501711451
result:
ok 1 number(s): "501711451"
Test #34:
score: 0
Accepted
time: 4ms
memory: 3776kb
input:
4909 1
output:
1
result:
ok 1 number(s): "1"
Test #35:
score: 0
Accepted
time: 3ms
memory: 3704kb
input:
30 3890
output:
146479684
result:
ok 1 number(s): "146479684"
Test #36:
score: 0
Accepted
time: 3ms
memory: 3684kb
input:
2081 3619
output:
991511011
result:
ok 1 number(s): "991511011"
Test #37:
score: 0
Accepted
time: 6ms
memory: 3792kb
input:
9511 10
output:
282597455
result:
ok 1 number(s): "282597455"
Test #38:
score: 0
Accepted
time: 2ms
memory: 3780kb
input:
21 36014
output:
305749705
result:
ok 1 number(s): "305749705"
Test #39:
score: 0
Accepted
time: 7ms
memory: 3760kb
input:
10049 6765
output:
275321949
result:
ok 1 number(s): "275321949"
Test #40:
score: 0
Accepted
time: 2ms
memory: 3776kb
input:
13036 23902
output:
885509275
result:
ok 1 number(s): "885509275"
Test #41:
score: 0
Accepted
time: 1ms
memory: 3704kb
input:
1 100000
output:
1
result:
ok 1 number(s): "1"
Test #42:
score: 0
Accepted
time: 27ms
memory: 3640kb
input:
100000 1
output:
1
result:
ok 1 number(s): "1"
Test #43:
score: 0
Accepted
time: 37ms
memory: 3708kb
input:
98765 95678
output:
302812642
result:
ok 1 number(s): "302812642"
Test #44:
score: 0
Accepted
time: 40ms
memory: 3840kb
input:
100000 100000
output:
174524777
result:
ok 1 number(s): "174524777"