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 |
---|---|---|---|---|---|---|---|---|---|
#169386 | #2908. count | cw | 100 | 7ms | 1848kb | C++11 | 821b | 2023-02-27 18:52:07 | 2023-02-27 18:52:09 |
answer
#include<bits/stdc++.h>
using namespace std;
const int mod=1e9+7;
int pls(int x,int y){return (x=(x+y)%mod)<0?x+mod:x;}
int mul(int x,int y){return pls(1ll*x*y%mod,0);}
int power(int x,int y=mod-2){
int c=1;
while(y){if(y&1){c=mul(c,x);}x=mul(x,x),y>>=1;}
return c;
}
int main(){
int t,Max=0;scanf("%d",&t);
vector< pair<int,int> > a(t);
for(pair<int,int>& i:a){
scanf("%d%d",&i.first,&i.second);
Max=max(Max,max(i.first,i.second));
}Max<<=1;
vector<int> fac(Max+1);
fac[0]=1;
for(int i=1;i<=Max;i++) fac[i]=mul(fac[i-1],i);
#define C(N,M) mul(fac[N],mul(power(fac[M]),power(fac[N-(M)])))
for(int i=0,n,m;i<t;i++){
n=a[i].first,m=a[i].second;
printf("%d\n",mul(mul(n,m)-1,C(n+m-2,n-1)));
}
return 0;
}
详细
小提示:点击横条可展开更详细的信息
Test #1:
score: 20
Accepted
time: 0ms
memory: 1236kb
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: 0ms
memory: 1236kb
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: 3ms
memory: 1848kb
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: 4ms
memory: 1848kb
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: 0ms
memory: 1848kb
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