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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#207309#2908. countA_WTB_A1001890ms79372kbC++638b2024-07-28 15:03:532024-07-28 15:03:55

answer

#include"bits/stdc++.h"
using namespace std;
typedef long long ll;
typedef pair<ll,ll>PLL;
const ll maxn=5e6+10,mod=1e9+7,inf=0x3f3f3f3f;
ll f[maxn],inv[maxn],n,m,t,ans;
ll c(ll n,ll m){
    return f[n]*inv[m]%mod*inv[n-m]%mod;
}void init(){
    inv[0]=inv[1]=f[0]=f[1]=1;
    for(int i=2;i<=maxn-1;i++)f[i]=f[i-1]*i%mod,inv[i]=(mod-mod/i)*inv[mod%i]%mod;
    for(int i=1;i<=maxn-1;i++)inv[i]=inv[i-1]*inv[i]%mod;
}
int main(){
    ios::sync_with_stdio(false);
    cin.tie(0),cout.tie(0);
    cin>>t;
    init();
    while(t--){
        cin>>n>>m;
        cout<<(n*m-1)*c(n+m-2,n-1)%mod<<endl;
    }
    return 0;
}

Details

小提示:点击横条可展开更详细的信息

Test #1:

score: 20
Accepted
time: 290ms
memory: 79368kb

input:

10
1 1
2000 1997
117 1647
392 452
959 1883
1046 1627
1398 1124
1372 306
1799 1007
111 1765

output:

0
57631948
737963048
807538931
137760374
398194748
77480423
174938019
583393917
445670336

result:

ok 10 lines

Test #2:

score: 20
Accepted
time: 323ms
memory: 79368kb

input:

10
1 1
2000 1997
1218 1479
350 1244
784 1715
999 92
396 1393
1726 1511
624 756
900 317

output:

0
57631948
610566455
356523655
593949258
665757514
349394180
73375269
50652564
663822508

result:

ok 10 lines

Test #3:

score: 20
Accepted
time: 438ms
memory: 79372kb

input:

10
1 1
100000 99997
36934 50467
5497 37576
83775 15544
23817 68917
33052 49207
59924 39340
2708 2614...

output:

0
73866797
788834869
539491921
582239610
497376436
343937059
324406513
13225836
35059446

result:

ok 10 lines

Test #4:

score: 20
Accepted
time: 442ms
memory: 79368kb

input:

10
1 1
100000 99997
6792 14252
90281 65716
46434 67120
18977 30384
16191 33996
3425 10433
31783 4263...

output:

0
73866797
609230597
213203975
638117274
527713366
525065128
867713025
174019248
375031322

result:

ok 10 lines

Test #5:

score: 20
Accepted
time: 397ms
memory: 79372kb

input:

10
1 1
100000 99994
47270 99792
93093 92620
88764 20724
48143 99711
33293 89038
2816 16811
97638 670...

output:

0
796648553
5720713
279796657
802039459
22848874
23038351
610731858
629891152
812026839

result:

ok 10 lines