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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 |
|---|---|---|---|---|---|---|---|---|---|
| #287481 | #5. 在线 O(1) 逆元 | acwing_gza | 100 ✓ | 5613ms | 394508kb | C++11 | 262b | 2023-12-20 17:13:34 | 2024-11-05 21:56:23 |
Judging History
answer
#include "inv.h"
const int N=1e8;
int mod;
int a[N+7];
void init(int p)
{
mod=p;
a[0]=a[1]=1;
for(register int i=2;i<=N;i++) a[i]=mod-1ll*(mod/i)*a[mod%i]%mod;
}
int inv(int x)
{
if(x<=N) return a[x];
return mod-1ll*(mod/x)*inv(mod%x)%mod;
}
详细
Pretests
Final Tests
Test #1:
score: 10
Accepted
time: 780ms
memory: 394372kb
Test #2:
score: 20
Accepted
time: 1244ms
memory: 394500kb
Test #3:
score: 30
Accepted
time: 3193ms
memory: 394432kb
Test #4:
score: 20
Accepted
time: 4652ms
memory: 394372kb
Test #5:
score: 20
Accepted
time: 5613ms
memory: 394508kb