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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 |
---|---|---|---|---|---|---|---|---|---|
#522692 | #2568. Mountains | z | AC ✓ | 6ms | 6244kb | C++14 | 1.1kb | 2024-08-17 11:24:36 | 2024-08-17 11:24:37 |
Judging History
answer
/*
设 a_{i,j} 为到达每个点的最大路径和,那么会出现 0-k-1 的 k 条不相交轮廓线
注意可以在边缘上交,向右下平移后转化为 LGV 引理模板题
*/
#include<bits/stdc++.h>
#define ll long long
using namespace std;
const ll MOD=1e9+7;
int n,m,k;
ll jc[645],inv[645];
ll a[645][645];
ll ksm(ll x,ll y){
ll ret=1;
while(y){
if(y&1) ret=ret*x%MOD;
x=x*x%MOD;
y>>=1;
}
return ret;
}
ll C(int x,int y){return x<y?0:jc[x]*inv[x-y]%MOD*inv[y]%MOD;}
ll Gauss(){
ll ret=1,f=1;
for(int i=0;i<k;i++){
for(int j=i+1;j<k;j++){
while(a[i][i]){
ll tmp=a[j][i]/a[i][i];
for(int t=i;t<k;t++)
(a[j][t]+=MOD-tmp*a[i][t]%MOD)%=MOD;
swap(a[i],a[j]);
f=-f;
}
swap(a[i],a[j]);
f=-f;
}
(ret*=a[i][i])%=MOD;
}
return (ret*f+MOD)%MOD;
}
int main(){
jc[0]=1;
for(int i=1;i<=211;i++) jc[i]=jc[i-1]*i%MOD;
inv[211]=ksm(jc[211],MOD-2);
for(int i=210;i>=0;i--) inv[i]=inv[i+1]*(i+1)%MOD;
scanf("%d%d%d",&n,&m,&k);
for(int i=0;i<k;i++){
for(int j=0;j<k;j++){
a[i][j]=C(n+m,n+i-j);
}
}
printf("%lld",Gauss());
return 0;
}
詳細信息
Test #1:
score: 100
Accepted
time: 0ms
memory: 3856kb
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: 1ms
memory: 3972kb
input:
2 3 4
output:
490
result:
ok 1 number(s): "490"
Test #4:
score: 0
Accepted
time: 1ms
memory: 3940kb
input:
1 2 8
output:
45
result:
ok 1 number(s): "45"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3724kb
input:
1 10 2
output:
66
result:
ok 1 number(s): "66"
Test #6:
score: 0
Accepted
time: 1ms
memory: 3736kb
input:
9 5 7
output:
371850968
result:
ok 1 number(s): "371850968"
Test #7:
score: 0
Accepted
time: 0ms
memory: 3712kb
input:
3 3 1
output:
20
result:
ok 1 number(s): "20"
Test #8:
score: 0
Accepted
time: 1ms
memory: 3796kb
input:
7 7 9
output:
166345303
result:
ok 1 number(s): "166345303"
Test #9:
score: 0
Accepted
time: 1ms
memory: 3872kb
input:
25 15 25
output:
850087558
result:
ok 1 number(s): "850087558"
Test #10:
score: 0
Accepted
time: 3ms
memory: 4108kb
input:
45 59 71
output:
659153227
result:
ok 1 number(s): "659153227"
Test #11:
score: 0
Accepted
time: 1ms
memory: 4080kb
input:
73 3 25
output:
683124269
result:
ok 1 number(s): "683124269"
Test #12:
score: 0
Accepted
time: 4ms
memory: 4300kb
input:
1 48 78
output:
446896916
result:
ok 1 number(s): "446896916"
Test #13:
score: 0
Accepted
time: 1ms
memory: 4068kb
input:
25 100 32
output:
966287506
result:
ok 1 number(s): "966287506"
Test #14:
score: 0
Accepted
time: 0ms
memory: 4028kb
input:
85 64 40
output:
125679545
result:
ok 1 number(s): "125679545"
Test #15:
score: 0
Accepted
time: 5ms
memory: 4384kb
input:
5 9 94
output:
620471576
result:
ok 1 number(s): "620471576"
Test #16:
score: 0
Accepted
time: 1ms
memory: 4156kb
input:
33 57 40
output:
637315057
result:
ok 1 number(s): "637315057"
Test #17:
score: 0
Accepted
time: 6ms
memory: 4440kb
input:
61 6 97
output:
362472796
result:
ok 1 number(s): "362472796"
Test #18:
score: 0
Accepted
time: 2ms
memory: 4172kb
input:
85 50 51
output:
192099209
result:
ok 1 number(s): "192099209"
Test #19:
score: 0
Accepted
time: 3ms
memory: 4256kb
input:
96 54 59
output:
714762612
result:
ok 1 number(s): "714762612"
Test #20:
score: 0
Accepted
time: 1ms
memory: 3892kb
input:
20 99 12
output:
772155662
result:
ok 1 number(s): "772155662"
Test #21:
score: 0
Accepted
time: 0ms
memory: 4160kb
input:
48 39 62
output:
670046604
result:
ok 1 number(s): "670046604"
Test #22:
score: 0
Accepted
time: 1ms
memory: 3972kb
input:
76 83 16
output:
976820079
result:
ok 1 number(s): "976820079"
Test #23:
score: 0
Accepted
time: 3ms
memory: 4140kb
input:
96 36 61
output:
20854557
result:
ok 1 number(s): "20854557"
Test #24:
score: 0
Accepted
time: 4ms
memory: 4300kb
input:
18 40 77
output:
261684871
result:
ok 1 number(s): "261684871"
Test #25:
score: 0
Accepted
time: 1ms
memory: 4024kb
input:
42 84 26
output:
458573307
result:
ok 1 number(s): "458573307"
Test #26:
score: 0
Accepted
time: 4ms
memory: 4232kb
input:
71 25 80
output:
875902815
result:
ok 1 number(s): "875902815"
Test #27:
score: 0
Accepted
time: 1ms
memory: 3960kb
input:
95 73 26
output:
922299967
result:
ok 1 number(s): "922299967"
Test #28:
score: 0
Accepted
time: 4ms
memory: 4128kb
input:
19 17 83
output:
494148696
result:
ok 1 number(s): "494148696"
Test #29:
score: 0
Accepted
time: 6ms
memory: 6244kb
input:
100 100 100
output:
192912055
result:
ok 1 number(s): "192912055"
Test #30:
score: 0
Accepted
time: 6ms
memory: 4400kb
input:
100 98 99
output:
412293529
result:
ok 1 number(s): "412293529"