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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#738715 | #9619. 乘积,欧拉函数,求和 | qstbcd | TL | 42ms | 5172kb | C++23 | 2.1kb | 2024-11-12 19:46:49 | 2024-11-12 19:46:50 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
#define int long long
const int N = 2e5 + 5;
const int mod = 998244353;
int __t = 1, n;
int prime[20] = {2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 1};
void solve() {
map<int, vector<pair<int, int>>> mp;
cin >> n;
for (int i = 1; i <= n; i++) {
int x;
cin >> x;
int nd = 0, sum = 1;
for (int i = 0; i < 16; i++) {
while (x % prime[i] == 0) {
x /= prime[i];
if ((nd & (1 << i)) == 1)
sum = (sum * prime[i]) % mod;
nd |= (1 << i);
}
}
mp[x].push_back({nd, sum});
}
// for (auto [x, vec] : mp) {
// for (auto [nd, sum] : vec) {
// cout << x << ' ' << nd << ' ' << sum << '\n';
// }
// }
vector<int> dp(1 << 17);
dp[0] = 1;
for (auto [x, vec] : mp) {
prime[16] = x;
for (auto [nd, sum] : vec) {
if (x != 1)
nd |= 1 << 16;
auto ndp = dp;
for (int i = 0; i < (1 << 17); i++) {
int nsum = sum, nnd = nd | i;
for (int j = 0; j < 17; j++) {
if ((i & (1 << j)) == 0 && (nd & (1 << j)) != 0) {
nsum = (nsum * max(prime[j] - 1, 1ll)) % mod;
}
if ((i & (1 << j)) != 0 && (nd & (1 << j)) != 0) {
nsum = (nsum * prime[j]) % mod;
}
}
ndp[nnd] = (ndp[nnd] + dp[i] * nsum % mod) % mod;
}
swap(dp, ndp);
}
for (int i = (1 << 16); i < (1 << 17); i++) {
int ni = i ^ (1 << 16);
dp[ni] = (dp[ni] + dp[i]) % mod;
dp[i] = 0;
}
}
int sum = 0;
for (auto i : dp) {
sum = (sum + i) % mod;
}
cout << sum << '\n';
return;
}
int32_t main() {
#ifdef ONLINE_JUDGE
ios::sync_with_stdio(false);
cin.tie(0);
#endif
// cin >> __t;
while (__t--)
solve();
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 38ms
memory: 5172kb
input:
5 1 6 8 6 2
output:
892
result:
ok single line: '892'
Test #2:
score: 0
Accepted
time: 42ms
memory: 5160kb
input:
5 3 8 3 7 8
output:
3157
result:
ok single line: '3157'
Test #3:
score: -100
Time Limit Exceeded
input:
2000 79 1 1 1 1 1 1 2803 1 1 1 1 1 1 1609 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2137 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 613 1 499 1 211 1 2927 1 1 1327 1 1 1123 1 907 1 2543 1 1 1 311 2683 1 1 1 1 2963 1 1 1 641 761 1 1 1 1 1 1 1 1 1 1 1 1489 2857 1 1 1 1 1 1 1 1 1 1 1 1 1 967 1 821 1 1 1 1 2143 1861...