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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#321823#8171. Colagrass8cowAC ✓190ms160196kbC++17773b2024-02-05 17:17:522024-02-05 17:17:53

Judging History

你现在查看的是最新测评结果

  • [2024-02-05 17:17:53]
  • 评测
  • 测评结果:AC
  • 用时:190ms
  • 内存:160196kb
  • [2024-02-05 17:17:52]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
int n,m,jc[20010000],ij[20010000];
const int mod=998244353;
int qpow(int a,int b){
	int c=1;
	for(;b;b>>=1){
		if(b&1)c=1ll*a*c%mod;
		a=1ll*a*a%mod;
	}
	return c;
}
int C(int a,int b){if(a<0||b<0||a<b)return 0;return 1ll*jc[a]*ij[b]%mod*ij[a-b]%mod;} 
int Z(int x){
	if(x<0)return 0;
	return C(x+n,n);
}
int main(){
	scanf("%d%d",&n,&m);m--;
	jc[0]=1;int O=n*2;
	for(int i=1;i<=O;i++)jc[i]=1ll*i*jc[i-1]%mod;
	ij[O]=qpow(jc[O],mod-2);
	for(int i=O;i;i--)ij[i-1]=1ll*i*ij[i]%mod;
	int ans=Z(m);
	for(int k=1;k*(k*3-1)/2<=m;k++){
		(ans+=((k&1)?-1:1)*Z(m-k*(k*3-1)/2))%=mod;
		(ans+=((k&1)?-1:1)*Z(m-k*(k*3+1)/2))%=mod;
	}
	//(1-x-x^2+x^5+x^7-)
	return printf("%d",(1ll*ans*ij[n]%mod+mod)%mod),0;
} 

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 0ms
memory: 3872kb

input:

2 1

output:

499122177

result:

ok "499122177"

Test #2:

score: 0
Accepted
time: 0ms
memory: 3732kb

input:

1 1

output:

1

result:

ok "1"

Test #3:

score: 0
Accepted
time: 0ms
memory: 3944kb

input:

167 91

output:

469117530

result:

ok "469117530"

Test #4:

score: 0
Accepted
time: 167ms
memory: 157016kb

input:

9806463 8975779

output:

125384417

result:

ok "125384417"

Test #5:

score: 0
Accepted
time: 143ms
memory: 146668kb

input:

9138576 8731432

output:

306972756

result:

ok "306972756"

Test #6:

score: 0
Accepted
time: 131ms
memory: 159792kb

input:

9978791 9033584

output:

932159263

result:

ok "932159263"

Test #7:

score: 0
Accepted
time: 181ms
memory: 157252kb

input:

9811954 9790000

output:

404679920

result:

ok "404679920"

Test #8:

score: 0
Accepted
time: 180ms
memory: 155276kb

input:

9685105 9276909

output:

32996715

result:

ok "32996715"

Test #9:

score: 0
Accepted
time: 173ms
memory: 160128kb

input:

10000000 10000000

output:

309225852

result:

ok "309225852"

Test #10:

score: 0
Accepted
time: 190ms
memory: 160108kb

input:

10000000 9999999

output:

635234302

result:

ok "635234302"

Test #11:

score: 0
Accepted
time: 162ms
memory: 159944kb

input:

10000000 9999998

output:

239117935

result:

ok "239117935"

Test #12:

score: 0
Accepted
time: 167ms
memory: 160104kb

input:

10000000 9999997

output:

294859983

result:

ok "294859983"

Test #13:

score: 0
Accepted
time: 155ms
memory: 159980kb

input:

9999999 9999999

output:

305530110

result:

ok "305530110"

Test #14:

score: 0
Accepted
time: 174ms
memory: 160112kb

input:

9999999 9999998

output:

164959553

result:

ok "164959553"

Test #15:

score: 0
Accepted
time: 171ms
memory: 159936kb

input:

9999999 9999997

output:

532215262

result:

ok "532215262"

Test #16:

score: 0
Accepted
time: 162ms
memory: 160132kb

input:

9999999 9999996

output:

123628609

result:

ok "123628609"

Test #17:

score: 0
Accepted
time: 169ms
memory: 160108kb

input:

9999998 9999998

output:

223852357

result:

ok "223852357"

Test #18:

score: 0
Accepted
time: 147ms
memory: 160036kb

input:

9999998 9999997

output:

75877991

result:

ok "75877991"

Test #19:

score: 0
Accepted
time: 170ms
memory: 160040kb

input:

9999998 9999996

output:

494540335

result:

ok "494540335"

Test #20:

score: 0
Accepted
time: 154ms
memory: 160108kb

input:

9999998 9999995

output:

19191738

result:

ok "19191738"

Test #21:

score: 0
Accepted
time: 175ms
memory: 160160kb

input:

9999997 9999997

output:

238385746

result:

ok "238385746"

Test #22:

score: 0
Accepted
time: 171ms
memory: 159940kb

input:

9999997 9999996

output:

138191521

result:

ok "138191521"

Test #23:

score: 0
Accepted
time: 179ms
memory: 160120kb

input:

9999997 9999995

output:

721536184

result:

ok "721536184"

Test #24:

score: 0
Accepted
time: 144ms
memory: 160036kb

input:

9999997 9999994

output:

627112720

result:

ok "627112720"

Test #25:

score: 0
Accepted
time: 138ms
memory: 130640kb

input:

8113616 1826492

output:

629546539

result:

ok "629546539"

Test #26:

score: 0
Accepted
time: 134ms
memory: 116756kb

input:

7230333 4233627

output:

870135249

result:

ok "870135249"

Test #27:

score: 0
Accepted
time: 180ms
memory: 155940kb

input:

9734872 9617286

output:

780426509

result:

ok "780426509"

Test #28:

score: 0
Accepted
time: 106ms
memory: 109676kb

input:

6780022 6393958

output:

508662111

result:

ok "508662111"

Test #29:

score: 0
Accepted
time: 86ms
memory: 81860kb

input:

4986441 1909344

output:

762587564

result:

ok "762587564"

Test #30:

score: 0
Accepted
time: 175ms
memory: 159192kb

input:

9936540 91728

output:

651924678

result:

ok "651924678"

Test #31:

score: 0
Accepted
time: 148ms
memory: 146056kb

input:

9099529 94239

output:

775532638

result:

ok "775532638"

Test #32:

score: 0
Accepted
time: 155ms
memory: 153384kb

input:

9564814 93545

output:

474538902

result:

ok "474538902"

Test #33:

score: 0
Accepted
time: 169ms
memory: 155536kb

input:

9707744 92094

output:

354024226

result:

ok "354024226"

Test #34:

score: 0
Accepted
time: 181ms
memory: 147180kb

input:

9167687 94820

output:

858989558

result:

ok "858989558"

Test #35:

score: 0
Accepted
time: 158ms
memory: 160040kb

input:

10000000 100000

output:

609345536

result:

ok "609345536"

Test #36:

score: 0
Accepted
time: 173ms
memory: 160108kb

input:

10000000 99999

output:

217258255

result:

ok "217258255"

Test #37:

score: 0
Accepted
time: 170ms
memory: 160108kb

input:

10000000 99998

output:

485057696

result:

ok "485057696"

Test #38:

score: 0
Accepted
time: 169ms
memory: 160188kb

input:

10000000 99997

output:

193579142

result:

ok "193579142"

Test #39:

score: 0
Accepted
time: 166ms
memory: 160088kb

input:

9999999 100000

output:

584105896

result:

ok "584105896"

Test #40:

score: 0
Accepted
time: 159ms
memory: 159984kb

input:

9999999 99999

output:

707014865

result:

ok "707014865"

Test #41:

score: 0
Accepted
time: 143ms
memory: 160044kb

input:

9999999 99998

output:

872987417

result:

ok "872987417"

Test #42:

score: 0
Accepted
time: 167ms
memory: 160036kb

input:

9999999 99997

output:

707304988

result:

ok "707304988"

Test #43:

score: 0
Accepted
time: 174ms
memory: 160036kb

input:

9999998 100000

output:

789028925

result:

ok "789028925"

Test #44:

score: 0
Accepted
time: 165ms
memory: 160188kb

input:

9999998 99999

output:

628266237

result:

ok "628266237"

Test #45:

score: 0
Accepted
time: 161ms
memory: 160192kb

input:

9999998 99998

output:

38358057

result:

ok "38358057"

Test #46:

score: 0
Accepted
time: 163ms
memory: 160116kb

input:

9999998 99997

output:

785931240

result:

ok "785931240"

Test #47:

score: 0
Accepted
time: 159ms
memory: 160196kb

input:

9999997 100000

output:

945452715

result:

ok "945452715"

Test #48:

score: 0
Accepted
time: 181ms
memory: 160124kb

input:

9999997 99999

output:

537126025

result:

ok "537126025"

Test #49:

score: 0
Accepted
time: 170ms
memory: 159936kb

input:

9999997 99998

output:

837196653

result:

ok "837196653"

Test #50:

score: 0
Accepted
time: 158ms
memory: 160044kb

input:

9999997 99997

output:

263045713

result:

ok "263045713"

Test #51:

score: 0
Accepted
time: 0ms
memory: 3780kb

input:

2 2

output:

1

result:

ok "1"

Test #52:

score: 0
Accepted
time: 0ms
memory: 3880kb

input:

3 3

output:

831870295

result:

ok "831870295"

Test #53:

score: 0
Accepted
time: 0ms
memory: 3876kb

input:

4 4

output:

374341633

result:

ok "374341633"

Test #54:

score: 0
Accepted
time: 0ms
memory: 3944kb

input:

3 2

output:

499122177

result:

ok "499122177"

Test #55:

score: 0
Accepted
time: 0ms
memory: 3688kb

input:

4 3

output:

623902721

result:

ok "623902721"

Test #56:

score: 0
Accepted
time: 0ms
memory: 3784kb

input:

5 4

output:

890101215

result:

ok "890101215"

Test #57:

score: 0
Accepted
time: 0ms
memory: 3852kb

input:

3 1

output:

166374059

result:

ok "166374059"

Test #58:

score: 0
Accepted
time: 0ms
memory: 3876kb

input:

4 2

output:

166374059

result:

ok "166374059"

Test #59:

score: 0
Accepted
time: 0ms
memory: 3692kb

input:

5 3

output:

16637406

result:

ok "16637406"

Test #60:

score: 0
Accepted
time: 0ms
memory: 3792kb

input:

6 4

output:

508827330

result:

ok "508827330"

Test #61:

score: 0
Accepted
time: 0ms
memory: 3856kb

input:

4 1

output:

291154603

result:

ok "291154603"

Test #62:

score: 0
Accepted
time: 0ms
memory: 3792kb

input:

5 2

output:

291154603

result:

ok "291154603"

Test #63:

score: 0
Accepted
time: 0ms
memory: 3792kb

input:

6 3

output:

859599304

result:

ok "859599304"

Test #64:

score: 0
Accepted
time: 0ms
memory: 3852kb

input:

7 4

output:

694809760

result:

ok "694809760"

Test #65:

score: 0
Accepted
time: 106ms
memory: 91736kb

input:

5629201 38642

output:

327294391

result:

ok "327294391"

Test #66:

score: 0
Accepted
time: 3ms
memory: 5840kb

input:

126092 74219

output:

27573951

result:

ok "27573951"

Test #67:

score: 0
Accepted
time: 143ms
memory: 138056kb

input:

8593075 8689

output:

393785113

result:

ok "393785113"

Test #68:

score: 0
Accepted
time: 20ms
memory: 20764kb

input:

1076972 58637

output:

600806929

result:

ok "600806929"

Test #69:

score: 0
Accepted
time: 11ms
memory: 11020kb

input:

463217 39187

output:

408712022

result:

ok "408712022"

Extra Test:

score: 0
Extra Test Passed