QOJ.ac
QOJ
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 |
---|---|---|---|---|---|---|---|---|---|
#474161 | #2568. Mountains | xbw_________ | AC ✓ | 2ms | 5008kb | C++14 | 1.3kb | 2024-07-12 16:25:57 | 2024-07-12 16:25:57 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
const int maxn=102,mod=1e9+7;
typedef long long ll;
int n,m,k;
ll a[maxn][maxn],c[maxn<<2][maxn<<2];
ll C(ll x,ll y){
if(x<0||y<0||x<y) return 0;
return c[x][y];
}
int main(){
cin>>n>>m>>k;
c[0][0]=1;
for(int i=1;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++){
//假设左上角(0,0),左下角(n,0),右上角(0,m)
//那么左下方第i个点是(n+i-1,i-1)
//那么右上方第j个点是(j-1,m+j-1)
//那么你需要从n+i-1走到j-1 从m+j-1走到i-1
//但是根据轮廓线定义 你只能往上或者左走
//所以你需要往上走n+i-1-(j-1)=n+i-j格
//所以你需要往上走m+j-1-(i-1)=m+j-i格
//也就是说n+i-j>=0,m+j-i>=0
//事实上这就符合C的一种补充定义:根据组合意义 不合法值为0
a[i][j]=C(n+m,n+i-j);
}
ll res=1;
for(int i=1;i<=k;i++){
for(int j=i+1;j<=k;j++){
while(a[i][i]){
ll div=a[j][i]/a[i][i]%mod;
for(int l=i;l<=k;l++)
a[j][l]=((a[j][l]-div*a[i][l])%mod+mod)%mod;
swap(a[i],a[j]);
res=-res;
}
swap(a[i],a[j]);
res=-res;
}
}
for(int i=1;i<=k;i++)
res=res*a[i][i]%mod;
cout<<(res%mod+mod)%mod<<'\n';
}
詳細信息
Test #1:
score: 100
Accepted
time: 0ms
memory: 3708kb
input:
1 1 1
output:
2
result:
ok 1 number(s): "2"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3664kb
input:
2 2 2
output:
20
result:
ok 1 number(s): "20"
Test #3:
score: 0
Accepted
time: 0ms
memory: 3696kb
input:
2 3 4
output:
490
result:
ok 1 number(s): "490"
Test #4:
score: 0
Accepted
time: 0ms
memory: 3760kb
input:
1 2 8
output:
45
result:
ok 1 number(s): "45"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3764kb
input:
1 10 2
output:
66
result:
ok 1 number(s): "66"
Test #6:
score: 0
Accepted
time: 0ms
memory: 3632kb
input:
9 5 7
output:
371850968
result:
ok 1 number(s): "371850968"
Test #7:
score: 0
Accepted
time: 0ms
memory: 3556kb
input:
3 3 1
output:
20
result:
ok 1 number(s): "20"
Test #8:
score: 0
Accepted
time: 0ms
memory: 3812kb
input:
7 7 9
output:
166345303
result:
ok 1 number(s): "166345303"
Test #9:
score: 0
Accepted
time: 1ms
memory: 3996kb
input:
25 15 25
output:
850087558
result:
ok 1 number(s): "850087558"
Test #10:
score: 0
Accepted
time: 1ms
memory: 4460kb
input:
45 59 71
output:
659153227
result:
ok 1 number(s): "659153227"
Test #11:
score: 0
Accepted
time: 1ms
memory: 4592kb
input:
73 3 25
output:
683124269
result:
ok 1 number(s): "683124269"
Test #12:
score: 0
Accepted
time: 1ms
memory: 4332kb
input:
1 48 78
output:
446896916
result:
ok 1 number(s): "446896916"
Test #13:
score: 0
Accepted
time: 1ms
memory: 4868kb
input:
25 100 32
output:
966287506
result:
ok 1 number(s): "966287506"
Test #14:
score: 0
Accepted
time: 1ms
memory: 4748kb
input:
85 64 40
output:
125679545
result:
ok 1 number(s): "125679545"
Test #15:
score: 0
Accepted
time: 2ms
memory: 3832kb
input:
5 9 94
output:
620471576
result:
ok 1 number(s): "620471576"
Test #16:
score: 0
Accepted
time: 0ms
memory: 4396kb
input:
33 57 40
output:
637315057
result:
ok 1 number(s): "637315057"
Test #17:
score: 0
Accepted
time: 2ms
memory: 4508kb
input:
61 6 97
output:
362472796
result:
ok 1 number(s): "362472796"
Test #18:
score: 0
Accepted
time: 1ms
memory: 4824kb
input:
85 50 51
output:
192099209
result:
ok 1 number(s): "192099209"
Test #19:
score: 0
Accepted
time: 1ms
memory: 4816kb
input:
96 54 59
output:
714762612
result:
ok 1 number(s): "714762612"
Test #20:
score: 0
Accepted
time: 1ms
memory: 4836kb
input:
20 99 12
output:
772155662
result:
ok 1 number(s): "772155662"
Test #21:
score: 0
Accepted
time: 1ms
memory: 4156kb
input:
48 39 62
output:
670046604
result:
ok 1 number(s): "670046604"
Test #22:
score: 0
Accepted
time: 1ms
memory: 4704kb
input:
76 83 16
output:
976820079
result:
ok 1 number(s): "976820079"
Test #23:
score: 0
Accepted
time: 2ms
memory: 4908kb
input:
96 36 61
output:
20854557
result:
ok 1 number(s): "20854557"
Test #24:
score: 0
Accepted
time: 1ms
memory: 4268kb
input:
18 40 77
output:
261684871
result:
ok 1 number(s): "261684871"
Test #25:
score: 0
Accepted
time: 1ms
memory: 4732kb
input:
42 84 26
output:
458573307
result:
ok 1 number(s): "458573307"
Test #26:
score: 0
Accepted
time: 2ms
memory: 4628kb
input:
71 25 80
output:
875902815
result:
ok 1 number(s): "875902815"
Test #27:
score: 0
Accepted
time: 1ms
memory: 4752kb
input:
95 73 26
output:
922299967
result:
ok 1 number(s): "922299967"
Test #28:
score: 0
Accepted
time: 2ms
memory: 3952kb
input:
19 17 83
output:
494148696
result:
ok 1 number(s): "494148696"
Test #29:
score: 0
Accepted
time: 2ms
memory: 5008kb
input:
100 100 100
output:
192912055
result:
ok 1 number(s): "192912055"
Test #30:
score: 0
Accepted
time: 2ms
memory: 4928kb
input:
100 98 99
output:
412293529
result:
ok 1 number(s): "412293529"