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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#488219 | #2568. Mountains | maojun | AC ✓ | 1ms | 4620kb | C++23 | 1006b | 2024-07-23 18:30:12 | 2024-07-23 18:30:12 |
Judging History
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
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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"