QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#476416 | #2568. Mountains | lefy | AC ✓ | 1ms | 4048kb | C++14 | 1.3kb | 2024-07-13 19:25:12 | 2024-07-13 19:25:13 |
Judging History
answer
#include<bits/stdc++.h>
#define ll long long
using namespace std;
const int N=110,mod=1e9+7;
ll pw(ll x,int cnt){
ll ans=1;
while(cnt){
if(cnt&1)ans=ans*x%mod;
x=x*x%mod;
cnt>>=1;
}
return ans;
}
ll fac[N<<2],inv[N<<2];
void init(int n){
fac[0]=1;
for(int i=1;i<=n;i++)fac[i]=fac[i-1]*i%mod;
inv[n]=pw(fac[n],mod-2);
for(int i=n-1;i>=0;i--)inv[i]=inv[i+1]*(i+1)%mod;
}
ll C(int x,int y){
if(x<y||x<0||y<0)return 0;
return fac[x]*inv[y]%mod*inv[x-y]%mod;
}
ll a[N][N];
ll get(int sx,int sy,int tx,int ty){
return C(tx-sx+ty-sy,tx-sx);
}
ll get(int n){
for(int i=1;i<=n;i++){
int id=0;
for(int j=i;j<=n;j++)if(a[j][i]){
id=j;break;
}
if(!id)return 0;
swap(a[i],a[id]);
ll tmp=pw(a[i][i],mod-2);
for(int j=i+1;j<=n;j++){
ll t=tmp*a[j][i]%mod;
for(int k=i;k<=n;k++)a[j][k]=(a[j][k]-a[i][k]*t%mod+mod)%mod;
}
}
ll ans=1;
for(int i=1;i<=n;i++)ans=ans*a[i][i]%mod;
return ans;
}
int main(){
init(400);
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++)a[i][j]=get(i,-i,n+j,m-j);
}
printf("%lld\n",get(K));
return 0;
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 3820kb
input:
1 1 1
output:
2
result:
ok 1 number(s): "2"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3900kb
input:
2 2 2
output:
20
result:
ok 1 number(s): "20"
Test #3:
score: 0
Accepted
time: 0ms
memory: 3964kb
input:
2 3 4
output:
490
result:
ok 1 number(s): "490"
Test #4:
score: 0
Accepted
time: 0ms
memory: 3808kb
input:
1 2 8
output:
45
result:
ok 1 number(s): "45"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3820kb
input:
1 10 2
output:
66
result:
ok 1 number(s): "66"
Test #6:
score: 0
Accepted
time: 0ms
memory: 3888kb
input:
9 5 7
output:
371850968
result:
ok 1 number(s): "371850968"
Test #7:
score: 0
Accepted
time: 0ms
memory: 3880kb
input:
3 3 1
output:
20
result:
ok 1 number(s): "20"
Test #8:
score: 0
Accepted
time: 0ms
memory: 3892kb
input:
7 7 9
output:
166345303
result:
ok 1 number(s): "166345303"
Test #9:
score: 0
Accepted
time: 0ms
memory: 3844kb
input:
25 15 25
output:
850087558
result:
ok 1 number(s): "850087558"
Test #10:
score: 0
Accepted
time: 1ms
memory: 3832kb
input:
45 59 71
output:
659153227
result:
ok 1 number(s): "659153227"
Test #11:
score: 0
Accepted
time: 0ms
memory: 3892kb
input:
73 3 25
output:
683124269
result:
ok 1 number(s): "683124269"
Test #12:
score: 0
Accepted
time: 1ms
memory: 3944kb
input:
1 48 78
output:
446896916
result:
ok 1 number(s): "446896916"
Test #13:
score: 0
Accepted
time: 0ms
memory: 3852kb
input:
25 100 32
output:
966287506
result:
ok 1 number(s): "966287506"
Test #14:
score: 0
Accepted
time: 0ms
memory: 3852kb
input:
85 64 40
output:
125679545
result:
ok 1 number(s): "125679545"
Test #15:
score: 0
Accepted
time: 1ms
memory: 3940kb
input:
5 9 94
output:
620471576
result:
ok 1 number(s): "620471576"
Test #16:
score: 0
Accepted
time: 0ms
memory: 3780kb
input:
33 57 40
output:
637315057
result:
ok 1 number(s): "637315057"
Test #17:
score: 0
Accepted
time: 1ms
memory: 4044kb
input:
61 6 97
output:
362472796
result:
ok 1 number(s): "362472796"
Test #18:
score: 0
Accepted
time: 0ms
memory: 3916kb
input:
85 50 51
output:
192099209
result:
ok 1 number(s): "192099209"
Test #19:
score: 0
Accepted
time: 1ms
memory: 3912kb
input:
96 54 59
output:
714762612
result:
ok 1 number(s): "714762612"
Test #20:
score: 0
Accepted
time: 0ms
memory: 3816kb
input:
20 99 12
output:
772155662
result:
ok 1 number(s): "772155662"
Test #21:
score: 0
Accepted
time: 1ms
memory: 3820kb
input:
48 39 62
output:
670046604
result:
ok 1 number(s): "670046604"
Test #22:
score: 0
Accepted
time: 0ms
memory: 3828kb
input:
76 83 16
output:
976820079
result:
ok 1 number(s): "976820079"
Test #23:
score: 0
Accepted
time: 1ms
memory: 3928kb
input:
96 36 61
output:
20854557
result:
ok 1 number(s): "20854557"
Test #24:
score: 0
Accepted
time: 1ms
memory: 3956kb
input:
18 40 77
output:
261684871
result:
ok 1 number(s): "261684871"
Test #25:
score: 0
Accepted
time: 0ms
memory: 3980kb
input:
42 84 26
output:
458573307
result:
ok 1 number(s): "458573307"
Test #26:
score: 0
Accepted
time: 1ms
memory: 3964kb
input:
71 25 80
output:
875902815
result:
ok 1 number(s): "875902815"
Test #27:
score: 0
Accepted
time: 0ms
memory: 3900kb
input:
95 73 26
output:
922299967
result:
ok 1 number(s): "922299967"
Test #28:
score: 0
Accepted
time: 1ms
memory: 4032kb
input:
19 17 83
output:
494148696
result:
ok 1 number(s): "494148696"
Test #29:
score: 0
Accepted
time: 0ms
memory: 3960kb
input:
100 100 100
output:
192912055
result:
ok 1 number(s): "192912055"
Test #30:
score: 0
Accepted
time: 1ms
memory: 4048kb
input:
100 98 99
output:
412293529
result:
ok 1 number(s): "412293529"