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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#464521#8171. Colaucup-team052#AC ✓433ms279104kbC++232.0kb2024-07-06 11:19:062024-07-06 11:19:06

Judging History

你现在查看的是最新测评结果

  • [2024-07-06 11:19:06]
  • 评测
  • 测评结果:AC
  • 用时:433ms
  • 内存:279104kb
  • [2024-07-06 11:19:06]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define eb emplace_back
//mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
#define mod 998244353
#define ll long long
#define inf 0x3f3f3f3f
#define INF 0x3f3f3f3f3f3f3f3f
inline int read()
{
	char ch=getchar(); int nega=1; while(!isdigit(ch)) {if(ch=='-') nega=-1; ch=getchar();}
	int ans=0; while(isdigit(ch)) {ans=ans*10+ch-48;ch=getchar();}
	if(nega==-1) return -ans;
	return ans;
}
void print(vector<int> x){for(int i=0;i<(int)x.size();i++) printf("%d%c",x[i]," \n"[i==(int)x.size()-1]);}
inline int add(int x,int y) {return x+y>=mod?x+y-mod:x+y;}
inline int add(int x,int y,int z) {return add(add(x,y),z);}
inline int sub(int x,int y) {return x-y<0?x-y+mod:x-y;}
inline int mul(int x,int y) {return 1LL*x*y%mod;}
inline int mul(int x,int y,int z) {return mul(mul(x,y),z);}
#define inc(x,y) x=add(x,y)
#define dec(x,y) x=sub(x,y)
int qpow(int x,int y)
{
	int ans=1;
	while(y)
	{
		if(y&1) ans=mul(ans,x);
		x=mul(x,x);
		y>>=1;
	}
	return ans;
}
int Inv(int x){return qpow(x,mod-2);}
#define N 20000005
int f[N];
int fac[N],inv[N],ifac[N];
void init()
{
	fac[0]=1; for(int i=1;i<N;i++) fac[i]=mul(fac[i-1],i);
	inv[0]=inv[1]=1; for(int i=2;i<N;i++) inv[i]=mul(mod-mod/i,inv[mod%i]);
	ifac[0]=1; for(int i=1;i<N;i++) ifac[i]=mul(ifac[i-1],inv[i]);
}
int C(int x,int y){return x>=y?mul(fac[x],ifac[x-y],ifac[y]):0;}

signed main()
{
	init();
	int n=read(),m=read();
	f[0]=1;
	for(int i=1;;i++)
	{
		int p=i*(3*i-1)/2;
		if(p<=m) f[p]=i&1?mod-1:1;
		p=i*(3*i+1)/2;
		if(p<=m) f[p]=i&1?mod-1:1;
		else break;
	}
	// for(int j=0;j<=m;j++) printf("%d%c",f[j]," \n"[j==m]);
	// for(int i=1;i<=n+1;i++)
	// {
		// for(int j=1;j<=m;j++) f[j]=add(f[j],f[j-1]);
		// for(int j=0;j<=m;j++) printf("%d%c",f[j]," \n"[j==m]);
	// }
	// int ans=f[m];
	int ans=0;
	for(int i=0;i<m;i++)
	{
		int coef=C(m-i+n-1,n);
		ans=add(ans,mul(coef,f[i]));
	}
	// cout<<ans<<endl;
	cout<<mul(ans,ifac[n])<<endl;
	return 0;
}



Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 323ms
memory: 239644kb

input:

2 1

output:

499122177

result:

ok "499122177"

Test #2:

score: 0
Accepted
time: 289ms
memory: 239612kb

input:

1 1

output:

1

result:

ok "1"

Test #3:

score: 0
Accepted
time: 310ms
memory: 239612kb

input:

167 91

output:

469117530

result:

ok "469117530"

Test #4:

score: 0
Accepted
time: 353ms
memory: 274860kb

input:

9806463 8975779

output:

125384417

result:

ok "125384417"

Test #5:

score: 0
Accepted
time: 360ms
memory: 272648kb

input:

9138576 8731432

output:

306972756

result:

ok "306972756"

Test #6:

score: 0
Accepted
time: 361ms
memory: 274144kb

input:

9978791 9033584

output:

932159263

result:

ok "932159263"

Test #7:

score: 0
Accepted
time: 362ms
memory: 276740kb

input:

9811954 9790000

output:

404679920

result:

ok "404679920"

Test #8:

score: 0
Accepted
time: 361ms
memory: 274376kb

input:

9685105 9276909

output:

32996715

result:

ok "32996715"

Test #9:

score: 0
Accepted
time: 358ms
memory: 278416kb

input:

10000000 10000000

output:

309225852

result:

ok "309225852"

Test #10:

score: 0
Accepted
time: 367ms
memory: 278112kb

input:

10000000 9999999

output:

635234302

result:

ok "635234302"

Test #11:

score: 0
Accepted
time: 361ms
memory: 277608kb

input:

10000000 9999998

output:

239117935

result:

ok "239117935"

Test #12:

score: 0
Accepted
time: 338ms
memory: 277544kb

input:

10000000 9999997

output:

294859983

result:

ok "294859983"

Test #13:

score: 0
Accepted
time: 358ms
memory: 279104kb

input:

9999999 9999999

output:

305530110

result:

ok "305530110"

Test #14:

score: 0
Accepted
time: 375ms
memory: 277772kb

input:

9999999 9999998

output:

164959553

result:

ok "164959553"

Test #15:

score: 0
Accepted
time: 371ms
memory: 277920kb

input:

9999999 9999997

output:

532215262

result:

ok "532215262"

Test #16:

score: 0
Accepted
time: 348ms
memory: 277500kb

input:

9999999 9999996

output:

123628609

result:

ok "123628609"

Test #17:

score: 0
Accepted
time: 358ms
memory: 277564kb

input:

9999998 9999998

output:

223852357

result:

ok "223852357"

Test #18:

score: 0
Accepted
time: 363ms
memory: 278648kb

input:

9999998 9999997

output:

75877991

result:

ok "75877991"

Test #19:

score: 0
Accepted
time: 374ms
memory: 277592kb

input:

9999998 9999996

output:

494540335

result:

ok "494540335"

Test #20:

score: 0
Accepted
time: 349ms
memory: 278656kb

input:

9999998 9999995

output:

19191738

result:

ok "19191738"

Test #21:

score: 0
Accepted
time: 369ms
memory: 277428kb

input:

9999997 9999997

output:

238385746

result:

ok "238385746"

Test #22:

score: 0
Accepted
time: 393ms
memory: 277532kb

input:

9999997 9999996

output:

138191521

result:

ok "138191521"

Test #23:

score: 0
Accepted
time: 369ms
memory: 278700kb

input:

9999997 9999995

output:

721536184

result:

ok "721536184"

Test #24:

score: 0
Accepted
time: 355ms
memory: 277312kb

input:

9999997 9999994

output:

627112720

result:

ok "627112720"

Test #25:

score: 0
Accepted
time: 309ms
memory: 245452kb

input:

8113616 1826492

output:

629546539

result:

ok "629546539"

Test #26:

score: 0
Accepted
time: 332ms
memory: 255036kb

input:

7230333 4233627

output:

870135249

result:

ok "870135249"

Test #27:

score: 0
Accepted
time: 336ms
memory: 277328kb

input:

9734872 9617286

output:

780426509

result:

ok "780426509"

Test #28:

score: 0
Accepted
time: 337ms
memory: 262956kb

input:

6780022 6393958

output:

508662111

result:

ok "508662111"

Test #29:

score: 0
Accepted
time: 317ms
memory: 246880kb

input:

4986441 1909344

output:

762587564

result:

ok "762587564"

Test #30:

score: 0
Accepted
time: 324ms
memory: 240236kb

input:

9936540 91728

output:

651924678

result:

ok "651924678"

Test #31:

score: 0
Accepted
time: 306ms
memory: 238880kb

input:

9099529 94239

output:

775532638

result:

ok "775532638"

Test #32:

score: 0
Accepted
time: 312ms
memory: 239112kb

input:

9564814 93545

output:

474538902

result:

ok "474538902"

Test #33:

score: 0
Accepted
time: 341ms
memory: 239224kb

input:

9707744 92094

output:

354024226

result:

ok "354024226"

Test #34:

score: 0
Accepted
time: 314ms
memory: 240280kb

input:

9167687 94820

output:

858989558

result:

ok "858989558"

Test #35:

score: 0
Accepted
time: 338ms
memory: 238968kb

input:

10000000 100000

output:

609345536

result:

ok "609345536"

Test #36:

score: 0
Accepted
time: 315ms
memory: 240192kb

input:

10000000 99999

output:

217258255

result:

ok "217258255"

Test #37:

score: 0
Accepted
time: 433ms
memory: 240284kb

input:

10000000 99998

output:

485057696

result:

ok "485057696"

Test #38:

score: 0
Accepted
time: 292ms
memory: 238560kb

input:

10000000 99997

output:

193579142

result:

ok "193579142"

Test #39:

score: 0
Accepted
time: 336ms
memory: 239872kb

input:

9999999 100000

output:

584105896

result:

ok "584105896"

Test #40:

score: 0
Accepted
time: 305ms
memory: 240268kb

input:

9999999 99999

output:

707014865

result:

ok "707014865"

Test #41:

score: 0
Accepted
time: 313ms
memory: 238588kb

input:

9999999 99998

output:

872987417

result:

ok "872987417"

Test #42:

score: 0
Accepted
time: 308ms
memory: 239280kb

input:

9999999 99997

output:

707304988

result:

ok "707304988"

Test #43:

score: 0
Accepted
time: 313ms
memory: 239928kb

input:

9999998 100000

output:

789028925

result:

ok "789028925"

Test #44:

score: 0
Accepted
time: 306ms
memory: 238984kb

input:

9999998 99999

output:

628266237

result:

ok "628266237"

Test #45:

score: 0
Accepted
time: 317ms
memory: 239156kb

input:

9999998 99998

output:

38358057

result:

ok "38358057"

Test #46:

score: 0
Accepted
time: 338ms
memory: 239596kb

input:

9999998 99997

output:

785931240

result:

ok "785931240"

Test #47:

score: 0
Accepted
time: 300ms
memory: 238688kb

input:

9999997 100000

output:

945452715

result:

ok "945452715"

Test #48:

score: 0
Accepted
time: 311ms
memory: 240232kb

input:

9999997 99999

output:

537126025

result:

ok "537126025"

Test #49:

score: 0
Accepted
time: 335ms
memory: 238728kb

input:

9999997 99998

output:

837196653

result:

ok "837196653"

Test #50:

score: 0
Accepted
time: 350ms
memory: 238832kb

input:

9999997 99997

output:

263045713

result:

ok "263045713"

Test #51:

score: 0
Accepted
time: 324ms
memory: 239312kb

input:

2 2

output:

1

result:

ok "1"

Test #52:

score: 0
Accepted
time: 332ms
memory: 239688kb

input:

3 3

output:

831870295

result:

ok "831870295"

Test #53:

score: 0
Accepted
time: 317ms
memory: 238444kb

input:

4 4

output:

374341633

result:

ok "374341633"

Test #54:

score: 0
Accepted
time: 306ms
memory: 239384kb

input:

3 2

output:

499122177

result:

ok "499122177"

Test #55:

score: 0
Accepted
time: 302ms
memory: 239980kb

input:

4 3

output:

623902721

result:

ok "623902721"

Test #56:

score: 0
Accepted
time: 297ms
memory: 238432kb

input:

5 4

output:

890101215

result:

ok "890101215"

Test #57:

score: 0
Accepted
time: 306ms
memory: 240028kb

input:

3 1

output:

166374059

result:

ok "166374059"

Test #58:

score: 0
Accepted
time: 309ms
memory: 238896kb

input:

4 2

output:

166374059

result:

ok "166374059"

Test #59:

score: 0
Accepted
time: 322ms
memory: 238892kb

input:

5 3

output:

16637406

result:

ok "16637406"

Test #60:

score: 0
Accepted
time: 301ms
memory: 238920kb

input:

6 4

output:

508827330

result:

ok "508827330"

Test #61:

score: 0
Accepted
time: 323ms
memory: 239588kb

input:

4 1

output:

291154603

result:

ok "291154603"

Test #62:

score: 0
Accepted
time: 328ms
memory: 239472kb

input:

5 2

output:

291154603

result:

ok "291154603"

Test #63:

score: 0
Accepted
time: 312ms
memory: 238396kb

input:

6 3

output:

859599304

result:

ok "859599304"

Test #64:

score: 0
Accepted
time: 310ms
memory: 238752kb

input:

7 4

output:

694809760

result:

ok "694809760"

Test #65:

score: 0
Accepted
time: 311ms
memory: 238364kb

input:

5629201 38642

output:

327294391

result:

ok "327294391"

Test #66:

score: 0
Accepted
time: 315ms
memory: 238268kb

input:

126092 74219

output:

27573951

result:

ok "27573951"

Test #67:

score: 0
Accepted
time: 304ms
memory: 239776kb

input:

8593075 8689

output:

393785113

result:

ok "393785113"

Test #68:

score: 0
Accepted
time: 316ms
memory: 238468kb

input:

1076972 58637

output:

600806929

result:

ok "600806929"

Test #69:

score: 0
Accepted
time: 289ms
memory: 238676kb

input:

463217 39187

output:

408712022

result:

ok "408712022"

Extra Test:

score: 0
Extra Test Passed