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QOJ
| ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
|---|---|---|---|---|---|---|---|---|---|
| #241570 | #5. 在线 O(1) 逆元 | Endline | 80 | 4935ms | 394524kb | C++14 | 407b | 2023-11-06 11:52:24 | 2024-11-05 21:55:11 |
Judging History
answer
#include<bits/stdc++.h>
#include"inv.h"
#define MAXN 100000002
using namespace std;
const int mod=998244353;
int now,Inv[MAXN];
int calc(int x)
{
if(x<=now)return Inv[x];
return 1ll*(mod-mod/x)*calc(mod%x)%mod;
}
void init(int p)
{
Inv[1]=1,now=1;
for(int i=2;i<=100000000;i++)
Inv[i]=calc(i),now=i;
}
int inv(int x)
{
if(x<=mod/2)return calc(x);
else return mod-calc(mod-x);
}
Details
Pretests
Final Tests
Test #1:
score: 10
Accepted
time: 808ms
memory: 394520kb
Test #2:
score: 20
Accepted
time: 1284ms
memory: 394376kb
Test #3:
score: 30
Accepted
time: 3068ms
memory: 394520kb
Test #4:
score: 20
Accepted
time: 4935ms
memory: 394524kb
Test #5:
score: 0
Time Limit Exceeded