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https://git.sb/baoshuo/OI-codes.git
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83 lines
2.0 KiB
C++
83 lines
2.0 KiB
C++
#pragma GCC optimize("Ofast")
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#include <bits/stdc++.h>
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using namespace std;
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int t, n, m, phi[1000005], cnt, prime[1000005];
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bool vis[1000005];
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void euler(int n) {
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phi[1] = 1;
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for (int i = 2; i <= n; i++) {
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if (!vis[i]) {
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phi[i] = i - 1;
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prime[++cnt] = i;
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}
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for (int j = 1; j <= cnt; j++) {
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if (1ll * i * prime[j] >= n) break;
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vis[i * prime[j]] = true;
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if (i % prime[j]) {
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phi[i * prime[j]] = phi[i] * (prime[j] - 1);
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} else {
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phi[i * prime[j]] = phi[i] * prime[j];
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break;
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}
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}
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}
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}
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int find(int l, int r, int x) {
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int res = 0;
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while (l <= r) {
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int mid = (l + r) >> 1;
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if (prime[mid] >= x) {
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res = mid;
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r = mid - 1;
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} else {
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l = mid + 1;
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}
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}
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return res;
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}
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int main() {
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std::ios::sync_with_stdio(false);
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cin >> t;
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euler(1000000);
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while (t--) {
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memset(vis, 0x00, sizeof(vis));
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cin >> m >> n;
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if (n <= 1000000) {
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int l = find(0, cnt, m);
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for (int i = l; i <= cnt; i++) {
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if (prime[i] > n) break;
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cout << prime[i] << endl;
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}
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} else {
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int l = m + (m & 1);
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if (l == 2) l += 2;
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for (int i = l; i <= n; i += 2) {
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vis[i - m] = true;
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}
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int d = sqrt(n) + 1;
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for (int i = 2; i <= cnt; i++) {
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if (prime[i] > d) break;
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int p = (m - 1) / prime[i] + 1;
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p += !(p & 1);
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if (p == 1) p += 2;
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for (int j = p; j * prime[i] <= n; j++) {
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vis[j * prime[i] - m] = true;
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}
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}
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for (int i = m; i <= n; i++) {
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if (!vis[i - m]) {
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cout << i << '\n';
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}
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}
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}
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cout << endl;
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}
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return 0;
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}
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