QOJ.ac
QOJ
| ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
|---|---|---|---|---|---|---|---|---|---|
| #293464 | #5. 在线 O(1) 逆元 | iee | 100 ✓ | 5244ms | 394464kb | C++14 | 358b | 2023-12-29 10:35:38 | 2024-11-05 21:57:11 |
Judging History
answer
#include "inv.h"
const int N = 1e8;
int mod;
int inv_list[N + 7];
void init(int p){
mod = p;
inv_list[0] = inv_list[1] = 1;
for (register int i = 2; i <= N; i++){
inv_list[i] = mod - 1ll * (mod / i) * inv_list[mod % i] % mod;
}
}
int inv(int x){
if (x <= N) return inv_list[x];
return mod - 1ll * (mod / x) * inv(mod % x) % mod;
}
Details
Pretests
Final Tests
Test #1:
score: 10
Accepted
time: 691ms
memory: 394324kb
Test #2:
score: 20
Accepted
time: 1143ms
memory: 394332kb
Test #3:
score: 30
Accepted
time: 3011ms
memory: 394384kb
Test #4:
score: 20
Accepted
time: 4345ms
memory: 394464kb
Test #5:
score: 20
Accepted
time: 5244ms
memory: 394364kb