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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#473997#2568. MountainsczcAC ✓2ms4596kbC++231.1kb2024-07-12 15:25:282024-07-12 15:25:29

Judging History

你现在查看的是最新测评结果

  • [2024-07-12 15:25:29]
  • 评测
  • 测评结果:AC
  • 用时:2ms
  • 内存:4596kb
  • [2024-07-12 15:25:28]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
const int maxn=105;
int n,m,k;
const int mod=1e9+7;
#define ll long long 
int a[maxn][maxn];
int c[maxn<<2][maxn<<2];
inline int h(int x,int y,int x2,int y2){
	if(x-x2<0 || y2-y<0) return 0;
	return c[x-x2+y2-y][x-x2];
}
int main(){
	scanf("%d%d%d",&n,&m,&k);
	c[0][0]=c[1][0]=c[1][1]=1;
	for(int i=2;i<=max(n,m)*4;i++){
		c[i][0]=1;
		for(int j=1;j<=i;j++)
			c[i][j]=(c[i-1][j-1]+c[i-1][j])%mod;
	} 
	for(int i=1;i<=k;i++){
		for(int j=1;j<=k;j++){
			a[i][j]=h(n+i-1,i-1,j-1,m+j-1);
		}
	}
	int f=1;
	for(int i=1;i<=k;i++){
		for(int j=i;j<=k;j++){
			if(a[j][i]){
				swap(a[j],a[i]);
				if(i!=j) f*=-1;
				break;
			}
		}
		if(!a[i][i]){
			puts("0");
			return 0;
		}
		for(int j=i+1;j<=k;j++){
			while(1){
				int delta=a[j][i]/a[i][i];
				for(int l=1;l<=k;l++) a[j][l]=(a[j][l]-(ll)delta*a[i][l]%mod+mod)%mod;
				if(!a[j][i]) break;
				swap(a[j],a[i]);
				f*=-1;
			}
		}
	}
	for(int i=1;i<=k;i++) f=(ll)f*a[i][i]%mod;
	f=(f+mod)%mod;
	printf("%d",f);
	return 0;
} 

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 0ms
memory: 3844kb

input:

1 1 1

output:

2

result:

ok 1 number(s): "2"

Test #2:

score: 0
Accepted
time: 0ms
memory: 3700kb

input:

2 2 2

output:

20

result:

ok 1 number(s): "20"

Test #3:

score: 0
Accepted
time: 0ms
memory: 3960kb

input:

2 3 4

output:

490

result:

ok 1 number(s): "490"

Test #4:

score: 0
Accepted
time: 0ms
memory: 3704kb

input:

1 2 8

output:

45

result:

ok 1 number(s): "45"

Test #5:

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

input:

1 10 2

output:

66

result:

ok 1 number(s): "66"

Test #6:

score: 0
Accepted
time: 0ms
memory: 3900kb

input:

9 5 7

output:

371850968

result:

ok 1 number(s): "371850968"

Test #7:

score: 0
Accepted
time: 0ms
memory: 3960kb

input:

3 3 1

output:

20

result:

ok 1 number(s): "20"

Test #8:

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

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: 1ms
memory: 4204kb

input:

45 59 71

output:

659153227

result:

ok 1 number(s): "659153227"

Test #11:

score: 0
Accepted
time: 0ms
memory: 4268kb

input:

73 3 25

output:

683124269

result:

ok 1 number(s): "683124269"

Test #12:

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

input:

1 48 78

output:

446896916

result:

ok 1 number(s): "446896916"

Test #13:

score: 0
Accepted
time: 1ms
memory: 4384kb

input:

25 100 32

output:

966287506

result:

ok 1 number(s): "966287506"

Test #14:

score: 0
Accepted
time: 1ms
memory: 4360kb

input:

85 64 40

output:

125679545

result:

ok 1 number(s): "125679545"

Test #15:

score: 0
Accepted
time: 2ms
memory: 3816kb

input:

5 9 94

output:

620471576

result:

ok 1 number(s): "620471576"

Test #16:

score: 0
Accepted
time: 1ms
memory: 4228kb

input:

33 57 40

output:

637315057

result:

ok 1 number(s): "637315057"

Test #17:

score: 0
Accepted
time: 2ms
memory: 4384kb

input:

61 6 97

output:

362472796

result:

ok 1 number(s): "362472796"

Test #18:

score: 0
Accepted
time: 1ms
memory: 4460kb

input:

85 50 51

output:

192099209

result:

ok 1 number(s): "192099209"

Test #19:

score: 0
Accepted
time: 0ms
memory: 4596kb

input:

96 54 59

output:

714762612

result:

ok 1 number(s): "714762612"

Test #20:

score: 0
Accepted
time: 1ms
memory: 4592kb

input:

20 99 12

output:

772155662

result:

ok 1 number(s): "772155662"

Test #21:

score: 0
Accepted
time: 1ms
memory: 4120kb

input:

48 39 62

output:

670046604

result:

ok 1 number(s): "670046604"

Test #22:

score: 0
Accepted
time: 1ms
memory: 4496kb

input:

76 83 16

output:

976820079

result:

ok 1 number(s): "976820079"

Test #23:

score: 0
Accepted
time: 1ms
memory: 4496kb

input:

96 36 61

output:

20854557

result:

ok 1 number(s): "20854557"

Test #24:

score: 0
Accepted
time: 1ms
memory: 4240kb

input:

18 40 77

output:

261684871

result:

ok 1 number(s): "261684871"

Test #25:

score: 0
Accepted
time: 1ms
memory: 4356kb

input:

42 84 26

output:

458573307

result:

ok 1 number(s): "458573307"

Test #26:

score: 0
Accepted
time: 1ms
memory: 4224kb

input:

71 25 80

output:

875902815

result:

ok 1 number(s): "875902815"

Test #27:

score: 0
Accepted
time: 1ms
memory: 4520kb

input:

95 73 26

output:

922299967

result:

ok 1 number(s): "922299967"

Test #28:

score: 0
Accepted
time: 1ms
memory: 3844kb

input:

19 17 83

output:

494148696

result:

ok 1 number(s): "494148696"

Test #29:

score: 0
Accepted
time: 0ms
memory: 4552kb

input:

100 100 100

output:

192912055

result:

ok 1 number(s): "192912055"

Test #30:

score: 0
Accepted
time: 2ms
memory: 4480kb

input:

100 98 99

output:

412293529

result:

ok 1 number(s): "412293529"