Submission #155731

#	Time	Username	Problem	Language	Result	Execution time	Memory
155731		Flying_dragon_02	Brunhilda’s Birthday (BOI13_brunhilda)	C++14	28.57 / 100	1100 ms	158056 KiB

brunhilda

#include <bits/stdc++.h>

using namespace std;

#define fi first
#define se second
#define pb push_back
#define mp make_pair

typedef pair<int, int> ii;

const int mod = 1e9 + 7;

const int inf = 1e9;

int add(int x, int y) {
    return (1ll * x + 1ll * y) % mod;
}

int del(int x, int y) {
    return ((1ll * x - 1ll * y) % mod + mod) % mod;
}

int mul(int x, int y) {
    return (1ll * x * 1ll * y) % mod;
}

const int N = 1e7 + 5;

int dp[2 * N], p[N];
bool used[N];
int bit[2 * N];

void update(int x, int val) {
    while(x > 0) {
        bit[x] = min(bit[x], val);
        x -= x & (-x);
    }
}

int get(int x) {
    if(x == 0) return 0;
    int val = inf;
    while(x < N) {
        val = min(val, bit[x]);
        x += x & (-x);
    }
    return val;
}

int m, q;

int main() {
    cin.tie(0), ios_base::sync_with_stdio(0);
    cin >> m >> q;
    for(int i = 0; i < N; i++)
        p[i] = inf;
    for(int i = 1; i <= N - 5; i++)
        bit[i] = dp[i] = inf;
    for(int i = 1; i <= m; i++) {
        int x;
        cin >> x;
        if(used[x]) continue;
        used[x] = 1;
        dp[x - 1] = 1;
        for(int l = 0; l < N; l++) {
            if(x * l >= N) break;
            p[x * l] = min(p[x * l], x);
        }
    }
    for(int i = N - 6; i >= 0; i--)
        dp[i] = min(dp[i + 1], dp[i]);
    for(int i = 1; i <= N - 5; i++) {
        dp[i] = min(dp[i], get(i));
        int num = i;
        while(1) {
            if(num % p[num] != 0) break;
            update(i + p[num] - 1, dp[i] + 1);
            int y = p[num];
            while(num % y == 0)
                num /= y;
        }
    }
    for(int i = 1; i <= q; i++) {
        int x;
        cin >> x;
        if(dp[x] == inf)
            cout << "oo\n";
        else
            cout << dp[x] << "\n";
    }
}

• Subtask 1: 10 / 20
• Subtask 2: 10 / 20
• Subtask 3: 8.571428571428571 / 60