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B3969 [GESP202403 五级] B-smooth 数
https://www.luogu.com.cn/record/174743452
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Luogu/B3969/B3969.cpp
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34
Luogu/B3969/B3969.cpp
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#include <iostream>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 1e6 + 5;
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int n, b, a[N]{0, 1}, cnt;
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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cin >> n >> b;
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for (int i = 2; i <= n; i++) {
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if (a[i] == 0) {
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for (int j = i; j <= n; j += i) {
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a[j] = i;
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}
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}
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}
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for (int i = 1; i <= n; i++) {
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if (a[i] <= b) {
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cnt++;
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}
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}
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cout << cnt << endl;
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return 0;
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}
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