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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#488219#2568. MountainsmaojunAC ✓1ms4620kbC++231006b2024-07-23 18:30:122024-07-23 18:30:12

Judging History

你现在查看的是最新测评结果

  • [2024-07-23 18:30:12]
  • 评测
  • 测评结果:AC
  • 用时:1ms
  • 内存:4620kb
  • [2024-07-23 18:30:12]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;

typedef long long ll;
const int N=405,K=105,MOD=1e9+7;
int n,m,k,C[N][N];

inline ll inv(ll x){ll r=1;for(int y=MOD-2;y;y>>=1,x=x*x%MOD)if(y&1)r=r*x%MOD;return r;}
inline int det(int n,int A[K][K]){
	ll res=1;
	for(int i=1;i<=n;i++){
		if(!A[i][i])for(int j=i+1;j<=n;j++){swap(A[i],A[j]);res=MOD-res;break;}
		if(!A[i][i])return 0;res=res*A[i][i]%MOD;
		for(int j=i,x=inv(A[i][i]);j<=n;j++)A[i][j]=(ll)A[i][j]*x%MOD;
		for(int j=i+1;j<=n;j++)for(int k=n;k>=i;k--)
			A[j][k]=(A[j][k]-(ll)A[j][i]*A[i][k]%MOD+MOD)%MOD;
	}
	return res;
}
int main(){
	scanf("%d%d%d",&n,&m,&k);
	for(int i=0;i<=n+m+k+k;i++){C[i][0]=1;for(int j=1;j<=i;j++)C[i][j]=(C[i-1][j]+C[i-1][j-1])%MOD;}
	static int A[K][K];
	for(int i=1;i<=k;i++)for(int j=1;j<=k;j++){
		int dx=n+i-j,dy=m-i+j;
		if(dx<0||dy<0)A[i][j]=0;
		else A[i][j]=C[dx+dy][dx];
//		printf("A(%d,%d)->B(%d,%d): %d\n",1-i,i-1,n-j+1,m+j-1,A[i][j]);
	}
	printf("%d\n",det(k,A));
	return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 1ms
memory: 3796kb

input:

1 1 1

output:

2

result:

ok 1 number(s): "2"

Test #2:

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

input:

2 2 2

output:

20

result:

ok 1 number(s): "20"

Test #3:

score: 0
Accepted
time: 0ms
memory: 3820kb

input:

2 3 4

output:

490

result:

ok 1 number(s): "490"

Test #4:

score: 0
Accepted
time: 0ms
memory: 3828kb

input:

1 2 8

output:

45

result:

ok 1 number(s): "45"

Test #5:

score: 0
Accepted
time: 0ms
memory: 3884kb

input:

1 10 2

output:

66

result:

ok 1 number(s): "66"

Test #6:

score: 0
Accepted
time: 0ms
memory: 3908kb

input:

9 5 7

output:

371850968

result:

ok 1 number(s): "371850968"

Test #7:

score: 0
Accepted
time: 0ms
memory: 3884kb

input:

3 3 1

output:

20

result:

ok 1 number(s): "20"

Test #8:

score: 0
Accepted
time: 0ms
memory: 3844kb

input:

7 7 9

output:

166345303

result:

ok 1 number(s): "166345303"

Test #9:

score: 0
Accepted
time: 0ms
memory: 4012kb

input:

25 15 25

output:

850087558

result:

ok 1 number(s): "850087558"

Test #10:

score: 0
Accepted
time: 0ms
memory: 4220kb

input:

45 59 71

output:

659153227

result:

ok 1 number(s): "659153227"

Test #11:

score: 0
Accepted
time: 0ms
memory: 4004kb

input:

73 3 25

output:

683124269

result:

ok 1 number(s): "683124269"

Test #12:

score: 0
Accepted
time: 1ms
memory: 4116kb

input:

1 48 78

output:

446896916

result:

ok 1 number(s): "446896916"

Test #13:

score: 0
Accepted
time: 0ms
memory: 4188kb

input:

25 100 32

output:

966287506

result:

ok 1 number(s): "966287506"

Test #14:

score: 0
Accepted
time: 0ms
memory: 4188kb

input:

85 64 40

output:

125679545

result:

ok 1 number(s): "125679545"

Test #15:

score: 0
Accepted
time: 1ms
memory: 4172kb

input:

5 9 94

output:

620471576

result:

ok 1 number(s): "620471576"

Test #16:

score: 0
Accepted
time: 0ms
memory: 4080kb

input:

33 57 40

output:

637315057

result:

ok 1 number(s): "637315057"

Test #17:

score: 0
Accepted
time: 1ms
memory: 4288kb

input:

61 6 97

output:

362472796

result:

ok 1 number(s): "362472796"

Test #18:

score: 0
Accepted
time: 1ms
memory: 4200kb

input:

85 50 51

output:

192099209

result:

ok 1 number(s): "192099209"

Test #19:

score: 0
Accepted
time: 1ms
memory: 4316kb

input:

96 54 59

output:

714762612

result:

ok 1 number(s): "714762612"

Test #20:

score: 0
Accepted
time: 0ms
memory: 3984kb

input:

20 99 12

output:

772155662

result:

ok 1 number(s): "772155662"

Test #21:

score: 0
Accepted
time: 1ms
memory: 4236kb

input:

48 39 62

output:

670046604

result:

ok 1 number(s): "670046604"

Test #22:

score: 0
Accepted
time: 0ms
memory: 4192kb

input:

76 83 16

output:

976820079

result:

ok 1 number(s): "976820079"

Test #23:

score: 0
Accepted
time: 0ms
memory: 4304kb

input:

96 36 61

output:

20854557

result:

ok 1 number(s): "20854557"

Test #24:

score: 0
Accepted
time: 1ms
memory: 4168kb

input:

18 40 77

output:

261684871

result:

ok 1 number(s): "261684871"

Test #25:

score: 0
Accepted
time: 0ms
memory: 4044kb

input:

42 84 26

output:

458573307

result:

ok 1 number(s): "458573307"

Test #26:

score: 0
Accepted
time: 1ms
memory: 4304kb

input:

71 25 80

output:

875902815

result:

ok 1 number(s): "875902815"

Test #27:

score: 0
Accepted
time: 0ms
memory: 4304kb

input:

95 73 26

output:

922299967

result:

ok 1 number(s): "922299967"

Test #28:

score: 0
Accepted
time: 1ms
memory: 4108kb

input:

19 17 83

output:

494148696

result:

ok 1 number(s): "494148696"

Test #29:

score: 0
Accepted
time: 1ms
memory: 4620kb

input:

100 100 100

output:

192912055

result:

ok 1 number(s): "192912055"

Test #30:

score: 0
Accepted
time: 1ms
memory: 4480kb

input:

100 98 99

output:

412293529

result:

ok 1 number(s): "412293529"