QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#573006 | #9309. Graph | OIer_kzc | AC ✓ | 2174ms | 25760kb | C++14 | 2.3kb | 2024-09-18 17:03:12 | 2024-09-18 17:03:13 |
Judging History
answer
#include <math.h>
#include <stdio.h>
#include <string.h>
#include <vector>
#include <algorithm>
#include <unordered_map>
#define LOG(FMT...) fprintf(stderr, FMT)
#define eb emplace_back
using namespace std;
typedef long long LL;
constexpr int N = 2000005, PC = 271234;
constexpr int mod = 998244353;
char gc() {
static char buf[1 << 21], *p1 = buf, *p2 = buf;
return (p1 == p2 && (p2 = (p1 = buf) + fread(buf, 1, 1 << 21, stdin), p1 == p2) ? -1 : *p1++);
}
int read() {
int x = 0; char c = gc();
while (c < 48 || c > 57) {
c = gc();
}
for (; c > 47 && c < 58; c = gc()) {
x = x * 10 + (c ^ 48);
}
return x;
}
int pr[PC], cnt;
bool was[N];
int c[N];
void sieve() {
for (int x = 2; x < N; ++x) {
if (!was[x]) {
pr[cnt++] = x;
}
for (int k = 0; x * pr[k] < N; ++k) {
was[x * pr[k]] = true;
if (!(x % pr[k])) {
break;
}
}
}
for (int i = 2; i < N; ++i) {
c[i] = c[i - 1] + !was[i];
}
}
constexpr int inv(int x, int k = mod - 2) {
int r = 1;
while (k) {
if (k & 1) {
r = x * (LL)r % mod;
}
x = x * (LL)x % mod;
k >>= 1;
}
return r;
}
LL sqr(int x) {
return x * (LL)x;
}
LL vs[N]; int szv;
LL g[N];
int id(LL v) {
int k = lower_bound(vs, vs + szv, v) - vs;
if (k < 0 || k >= szv || vs[k] != v) {
LOG("ERR\n");
while (true);
}
return k;
}
void min25(LL n) {
for (LL l = 1, r; l <= n; l = r + 1) {
r = n / (n / l);
vs[szv++] = n / r;
}
reverse(vs, vs + szv);
for (int i = 0; i < szv; ++i) {
g[i] = vs[i] - 1;
}
LL B;
for (int i = 0; (B = sqr(pr[i])) <= n; ++i) {
for (int j = szv - 1; vs[j] >= B; --j) {
g[j] += i - g[id(vs[j] / pr[i])];
}
}
}
LL calc(LL x) {
return g[id(x)];
}
constexpr int f(LL x) {
if (x == 1) {
return 1;
}
if (x == 2) {
return 1;
}
if (x == 3) {
return 3;
}
LL y = calc(x) - calc(x / 2);
return (x - y - 1) % mod * inv(x % mod, y % (mod - 1)) % mod;
}
int main() {
// LOG("%.3lf\n", (sizeof c + sizeof was + sizeof pr) / 1048576.0);
sieve();
LL n;
scanf("%lld", &n);
min25(n);
int res = 1;
for (LL l = 1, r; l <= n; l = r + 1) {
r = n / (n / l);
res = res * (LL)inv(f(n / r), (r - l + 1) % (mod - 1)) % mod;
}
printf("%d\n", res);
return 0;
}
这程序好像有点Bug,我给组数据试试?
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 5ms
memory: 11956kb
input:
4
output:
8
result:
ok answer is '8'
Test #2:
score: 0
Accepted
time: 7ms
memory: 11988kb
input:
2
output:
1
result:
ok answer is '1'
Test #3:
score: 0
Accepted
time: 7ms
memory: 11992kb
input:
123
output:
671840470
result:
ok answer is '671840470'
Test #4:
score: 0
Accepted
time: 7ms
memory: 11968kb
input:
233
output:
353738465
result:
ok answer is '353738465'
Test #5:
score: 0
Accepted
time: 11ms
memory: 11928kb
input:
5981
output:
970246821
result:
ok answer is '970246821'
Test #6:
score: 0
Accepted
time: 4ms
memory: 13644kb
input:
86422
output:
897815688
result:
ok answer is '897815688'
Test #7:
score: 0
Accepted
time: 3ms
memory: 11944kb
input:
145444
output:
189843901
result:
ok answer is '189843901'
Test #8:
score: 0
Accepted
time: 12ms
memory: 11912kb
input:
901000
output:
819449452
result:
ok answer is '819449452'
Test #9:
score: 0
Accepted
time: 8ms
memory: 12036kb
input:
1000000
output:
113573943
result:
ok answer is '113573943'
Test #10:
score: 0
Accepted
time: 19ms
memory: 13804kb
input:
23333333
output:
949849384
result:
ok answer is '949849384'
Test #11:
score: 0
Accepted
time: 23ms
memory: 14224kb
input:
102850434
output:
604886751
result:
ok answer is '604886751'
Test #12:
score: 0
Accepted
time: 91ms
memory: 12972kb
input:
998244353
output:
0
result:
ok answer is '0'
Test #13:
score: 0
Accepted
time: 99ms
memory: 12976kb
input:
1000000007
output:
318420284
result:
ok answer is '318420284'
Test #14:
score: 0
Accepted
time: 156ms
memory: 15280kb
input:
2147483547
output:
688759898
result:
ok answer is '688759898'
Test #15:
score: 0
Accepted
time: 277ms
memory: 18808kb
input:
5120103302
output:
116870489
result:
ok answer is '116870489'
Test #16:
score: 0
Accepted
time: 701ms
memory: 17932kb
input:
19834593299
output:
523663743
result:
ok answer is '523663743'
Test #17:
score: 0
Accepted
time: 1396ms
memory: 20584kb
input:
52500109238
output:
195086665
result:
ok answer is '195086665'
Test #18:
score: 0
Accepted
time: 1961ms
memory: 23612kb
input:
84848352911
output:
107959260
result:
ok answer is '107959260'
Test #19:
score: 0
Accepted
time: 2151ms
memory: 24304kb
input:
99824435322
output:
0
result:
ok answer is '0'
Test #20:
score: 0
Accepted
time: 2156ms
memory: 24244kb
input:
99999999354
output:
316301711
result:
ok answer is '316301711'
Test #21:
score: 0
Accepted
time: 2174ms
memory: 25760kb
input:
100000000000
output:
396843576
result:
ok answer is '396843576'
Extra Test:
score: 0
Extra Test Passed