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ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#50489 | #2568. Mountains | xiaoyaowudi | AC ✓ | 1ms | 2024kb | C++17 | 1.0kb | 2022-09-26 19:14:21 | 2022-09-26 19:14:22 |
Judging History
answer
#include <cstdio>
#include <algorithm>
using namespace std;
constexpr int N=110,p=1e9+7;
int fp(int a,int b){int ans=1,off=a;while(b){if(b&1) ans=1ll*ans*off%p;off=1ll*off*off%p;b>>=1;}return ans;}
int det[N][N],fac[N<<1],ifac[N<<1];
int calc(int a,int b){
if(a<0 || b<0) return 0;
return 1ll*fac[a+b]*ifac[a]%p*ifac[b]%p;
}
int main(){
fac[0]=1;
for(int i=1;i<(N<<1);++i) fac[i]=1ll*fac[i-1]*i%p;
ifac[(N<<1)-1]=fp(fac[(N<<1)-1],p-2);
for(int i=(N<<1)-2;i>=0;--i) ifac[i]=1ll*ifac[i+1]*(i+1)%p;
int n,m,k;scanf("%d%d%d",&n,&m,&k);
for(int i=1;i<=k;++i){
for(int j=1;j<=k;++j){
det[i][j]=calc(n+i-j,m+j-i);
}
}
int ans=1;
for(int i=1;i<=k;++i){
int pos=0;
for(int j=i;j<=k;++j) if(det[j][i]) pos=j;
if(!pos){ans=0;break;}
if(pos!=i) swap(det[pos],det[i]),ans=p-ans;
int num=p-fp(det[i][i],p-2);
for(int j=i+1;j<=k;++j){
int cur=1ll*num*det[j][i]%p;
for(int t=i;t<=k;++t) det[j][t]=(det[j][t]+1ll*cur*det[i][t])%p;
}
}
for(int i=1;i<=k;++i) ans=1ll*ans*det[i][i]%p;
printf("%d\n",ans);
return 0;
}
詳細信息
Test #1:
score: 100
Accepted
time: 1ms
memory: 1768kb
input:
1 1 1
output:
2
result:
ok 1 number(s): "2"
Test #2:
score: 0
Accepted
time: 1ms
memory: 1776kb
input:
2 2 2
output:
20
result:
ok 1 number(s): "20"
Test #3:
score: 0
Accepted
time: 1ms
memory: 2024kb
input:
2 3 4
output:
490
result:
ok 1 number(s): "490"
Test #4:
score: 0
Accepted
time: 1ms
memory: 1808kb
input:
1 2 8
output:
45
result:
ok 1 number(s): "45"
Test #5:
score: 0
Accepted
time: 0ms
memory: 1764kb
input:
1 10 2
output:
66
result:
ok 1 number(s): "66"
Test #6:
score: 0
Accepted
time: 1ms
memory: 1764kb
input:
9 5 7
output:
371850968
result:
ok 1 number(s): "371850968"
Test #7:
score: 0
Accepted
time: 1ms
memory: 1840kb
input:
3 3 1
output:
20
result:
ok 1 number(s): "20"
Test #8:
score: 0
Accepted
time: 0ms
memory: 1840kb
input:
7 7 9
output:
166345303
result:
ok 1 number(s): "166345303"
Test #9:
score: 0
Accepted
time: 1ms
memory: 1788kb
input:
25 15 25
output:
850087558
result:
ok 1 number(s): "850087558"
Test #10:
score: 0
Accepted
time: 1ms
memory: 1848kb
input:
45 59 71
output:
659153227
result:
ok 1 number(s): "659153227"
Test #11:
score: 0
Accepted
time: 1ms
memory: 1848kb
input:
73 3 25
output:
683124269
result:
ok 1 number(s): "683124269"
Test #12:
score: 0
Accepted
time: 1ms
memory: 1780kb
input:
1 48 78
output:
446896916
result:
ok 1 number(s): "446896916"
Test #13:
score: 0
Accepted
time: 1ms
memory: 1768kb
input:
25 100 32
output:
966287506
result:
ok 1 number(s): "966287506"
Test #14:
score: 0
Accepted
time: 0ms
memory: 1776kb
input:
85 64 40
output:
125679545
result:
ok 1 number(s): "125679545"
Test #15:
score: 0
Accepted
time: 0ms
memory: 1764kb
input:
5 9 94
output:
620471576
result:
ok 1 number(s): "620471576"
Test #16:
score: 0
Accepted
time: 1ms
memory: 1980kb
input:
33 57 40
output:
637315057
result:
ok 1 number(s): "637315057"
Test #17:
score: 0
Accepted
time: 1ms
memory: 1772kb
input:
61 6 97
output:
362472796
result:
ok 1 number(s): "362472796"
Test #18:
score: 0
Accepted
time: 1ms
memory: 1844kb
input:
85 50 51
output:
192099209
result:
ok 1 number(s): "192099209"
Test #19:
score: 0
Accepted
time: 0ms
memory: 1776kb
input:
96 54 59
output:
714762612
result:
ok 1 number(s): "714762612"
Test #20:
score: 0
Accepted
time: 1ms
memory: 1844kb
input:
20 99 12
output:
772155662
result:
ok 1 number(s): "772155662"
Test #21:
score: 0
Accepted
time: 1ms
memory: 1984kb
input:
48 39 62
output:
670046604
result:
ok 1 number(s): "670046604"
Test #22:
score: 0
Accepted
time: 1ms
memory: 1776kb
input:
76 83 16
output:
976820079
result:
ok 1 number(s): "976820079"
Test #23:
score: 0
Accepted
time: 1ms
memory: 1840kb
input:
96 36 61
output:
20854557
result:
ok 1 number(s): "20854557"
Test #24:
score: 0
Accepted
time: 1ms
memory: 1772kb
input:
18 40 77
output:
261684871
result:
ok 1 number(s): "261684871"
Test #25:
score: 0
Accepted
time: 1ms
memory: 1820kb
input:
42 84 26
output:
458573307
result:
ok 1 number(s): "458573307"
Test #26:
score: 0
Accepted
time: 1ms
memory: 1784kb
input:
71 25 80
output:
875902815
result:
ok 1 number(s): "875902815"
Test #27:
score: 0
Accepted
time: 1ms
memory: 1724kb
input:
95 73 26
output:
922299967
result:
ok 1 number(s): "922299967"
Test #28:
score: 0
Accepted
time: 1ms
memory: 1820kb
input:
19 17 83
output:
494148696
result:
ok 1 number(s): "494148696"
Test #29:
score: 0
Accepted
time: 1ms
memory: 1876kb
input:
100 100 100
output:
192912055
result:
ok 1 number(s): "192912055"
Test #30:
score: 0
Accepted
time: 1ms
memory: 1772kb
input:
100 98 99
output:
412293529
result:
ok 1 number(s): "412293529"