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#include <iostream>#include <cstring>#include <algorithm>using namespace std; const int maxn = 1000000 + 5;const int P1 = 998244353, P2 = 1000000007;const int B1 = 2, B2 = 31;const int K1 = 0, K2 = 13; typedef long long ll; int n;bool p[maxn];int p1[maxn], p2[maxn]; struct H {    int h1, h2, l;    H(bool b = false) {        h1 = b + K1;        h2 = b + K2;        l = 1;    }     H operator + (const H & h) const {        H hh;        hh.l = l + h.l;        hh.h1 = (1ll * h1 * p1[h.l] + h.h1) % P1;        hh.h2 = (1ll * h2 * p2[h.l] + h.h2) % P2;        return hh;    }     bool operator == (const H & h) const {        return l == h.l && h1 == h.h1 && h2 == h.h2;    }     bool operator < (const H & h) const {        if (l != h.l) return l < h.l;        else if (h1 != h.h1) return h1 < h.h1;        else return h2 < h.h2;    }} h[maxn]; void init() {    memset(p, 1, sizeof(p));    p[0] = p[1] = false;    p1[0] = p2[0] = 1;    for (int i = 1; i <= n; ++i) {        p1[i] = (1ll * B1 * p1[i-1]) % P1;        p2[i] = (1ll * B2 * p2[i-1]) % P2;        if (!p[i]) continue;        for (int j = 2 * i; j <= n; j += i) {            p[j] = false;        }    }} int solve() {    for (int i = n; i; --i) {        h[i] = H(p[i]);        if (2 * i + 1 <= n) {            h[i] = h[2 * i] + h[i] + h[2 * i + 1];        } else if (2 * i <= n) {            h[i] = h[2 * i] + h[i];        }    }     cout << h[1].h1 << endl;    sort(h + 1, h + n + 1);    int m = unique(h + 1, h + n + 1) - (h + 1);    return m;} int main() {    cin >> n;    init();    cout << solve() << endl;}
第29题判断题原卷 1.5 分

若修改常数 B1 或 K1 的值,该程序可能会输出不同的结果。( )

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