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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 |
---|---|---|---|---|---|---|---|---|---|
#51707 | #959. Multiple? | zhouhuanyi | AC ✓ | 1055ms | 3800kb | C++11 | 827b | 2022-10-03 16:11:53 | 2022-10-03 16:11:54 |
Judging History
answer
#include<iostream>
#include<cstdio>
#define mod 998244353
using namespace std;
int read()
{
char c=0;
int sum=0;
while (c<'0'||c>'9') c=getchar();
while ('0'<=c&&c<='9') sum=sum*10+c-'0',c=getchar();
return sum;
}
int fast_pow(int a,int b)
{
int res=1,mul=a;
while (b)
{
if (b&1) res=1ll*res*mul%mod;
mul=1ll*mul*mul%mod,b>>=1;
}
return res;
}
void Adder(int &x,int d)
{
x+=d;
if (x>=mod) x-=mod;
return;
}
int n,phin,k,res,ans,ans2;
int main()
{
res=n=phin=read(),k=read();
for (int i=2;i*i<=n;++i)
if (res%i==0)
{
phin=phin/i*(i-1);
while (res%i==0) res/=i;
}
if (res!=1) phin=phin/res*(res-1);
ans=ans2=1;
for (int i=1;i<=k-1;++i) ans=1ll*ans*(n-i)%mod,ans2=1ll*ans2*i%mod;
printf("%lld\n",1ll*ans*fast_pow(ans2,mod-2)%mod*phin%mod);
return 0;
}
詳細信息
Test #1:
score: 100
Accepted
time: 2ms
memory: 3708kb
input:
4 1
output:
2
result:
ok 1 number(s): "2"
Test #2:
score: 0
Accepted
time: 2ms
memory: 3648kb
input:
9 2
output:
48
result:
ok 1 number(s): "48"
Test #3:
score: 0
Accepted
time: 0ms
memory: 3684kb
input:
222222222 222222
output:
851798824
result:
ok 1 number(s): "851798824"
Test #4:
score: 0
Accepted
time: 1055ms
memory: 3628kb
input:
998244352 249561088
output:
100663296
result:
ok 1 number(s): "100663296"
Test #5:
score: 0
Accepted
time: 2ms
memory: 3668kb
input:
62 3
output:
54900
result:
ok 1 number(s): "54900"
Test #6:
score: 0
Accepted
time: 3ms
memory: 3652kb
input:
328 42
output:
9805666
result:
ok 1 number(s): "9805666"
Test #7:
score: 0
Accepted
time: 1ms
memory: 3572kb
input:
318 67
output:
603200201
result:
ok 1 number(s): "603200201"
Test #8:
score: 0
Accepted
time: 3ms
memory: 3700kb
input:
1368 16
output:
105422469
result:
ok 1 number(s): "105422469"
Test #9:
score: 0
Accepted
time: 2ms
memory: 3636kb
input:
50715 7550
output:
618459631
result:
ok 1 number(s): "618459631"
Test #10:
score: 0
Accepted
time: 0ms
memory: 3712kb
input:
76973 14799
output:
468374999
result:
ok 1 number(s): "468374999"
Test #11:
score: 0
Accepted
time: 0ms
memory: 3788kb
input:
99380 19487
output:
687640903
result:
ok 1 number(s): "687640903"
Test #12:
score: 0
Accepted
time: 1ms
memory: 3568kb
input:
21790 2731
output:
101785330
result:
ok 1 number(s): "101785330"
Test #13:
score: 0
Accepted
time: 1ms
memory: 3700kb
input:
690640 123082
output:
867724310
result:
ok 1 number(s): "867724310"
Test #14:
score: 0
Accepted
time: 1ms
memory: 3784kb
input:
491216 62882
output:
359870082
result:
ok 1 number(s): "359870082"
Test #15:
score: 0
Accepted
time: 2ms
memory: 3568kb
input:
331430 27658
output:
336996189
result:
ok 1 number(s): "336996189"
Test #16:
score: 0
Accepted
time: 2ms
memory: 3740kb
input:
171644 19051
output:
291982732
result:
ok 1 number(s): "291982732"
Test #17:
score: 0
Accepted
time: 1ms
memory: 3684kb
input:
4480506 212264
output:
613147340
result:
ok 1 number(s): "613147340"
Test #18:
score: 0
Accepted
time: 1ms
memory: 3684kb
input:
436959 48003
output:
451377650
result:
ok 1 number(s): "451377650"
Test #19:
score: 0
Accepted
time: 3ms
memory: 3800kb
input:
6393409 1221473
output:
573934740
result:
ok 1 number(s): "573934740"
Test #20:
score: 0
Accepted
time: 5ms
memory: 3700kb
input:
7381276 607288
output:
895895324
result:
ok 1 number(s): "895895324"
Test #21:
score: 0
Accepted
time: 7ms
memory: 3632kb
input:
7951897 1124478
output:
9197219
result:
ok 1 number(s): "9197219"
Test #22:
score: 0
Accepted
time: 9ms
memory: 3700kb
input:
10822617 1773938
output:
200848469
result:
ok 1 number(s): "200848469"
Test #23:
score: 0
Accepted
time: 9ms
memory: 3696kb
input:
13693337 1629029
output:
390448867
result:
ok 1 number(s): "390448867"
Test #24:
score: 0
Accepted
time: 24ms
memory: 3688kb
input:
21596632 5162607
output:
286800922
result:
ok 1 number(s): "286800922"
Test #25:
score: 0
Accepted
time: 290ms
memory: 3628kb
input:
483262472 68378363
output:
805389870
result:
ok 1 number(s): "805389870"
Test #26:
score: 0
Accepted
time: 323ms
memory: 3700kb
input:
504666092 76509085
output:
487083023
result:
ok 1 number(s): "487083023"
Test #27:
score: 0
Accepted
time: 350ms
memory: 3696kb
input:
828059612 83073089
output:
328505426
result:
ok 1 number(s): "328505426"
Test #28:
score: 0
Accepted
time: 44ms
memory: 3716kb
input:
153208783 10166904
output:
109080048
result:
ok 1 number(s): "109080048"
Test #29:
score: 0
Accepted
time: 281ms
memory: 3740kb
input:
476602303 67863017
output:
414678607
result:
ok 1 number(s): "414678607"
Test #30:
score: 0
Accepted
time: 177ms
memory: 3696kb
input:
498005923 42023403
output:
754443127
result:
ok 1 number(s): "754443127"
Test #31:
score: 0
Accepted
time: 105ms
memory: 3656kb
input:
125144994 23866191
output:
754831055
result:
ok 1 number(s): "754831055"
Test #32:
score: 0
Accepted
time: 21ms
memory: 3652kb
input:
146548614 4304228
output:
655902521
result:
ok 1 number(s): "655902521"