Submission #222287

#	Time	Username	Problem	Language	Result	Execution time	Memory
222287		lyc	Brunhilda’s Birthday (BOI13_brunhilda)	C++14	78.10 / 100	292 ms	80248 KiB

brunhilda

#include <bits/stdc++.h>
using namespace std;

#define SZ(x) (int)(x).size()
#define FOR(i,a,b) for(int i=(a);i<=(b);++i)
#define RFOR(i, a, b) for (int i=a;i>=b;--i)

const int MX_M = 1e5+5;
const int MX_Q = 1e5+5;
const int MX_P = 1e7+5;
const int infty = 1e9;

int M, Q, P[MX_M];
int pi[MX_P], dp[MX_P];

using ii = pair<int, int>;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    cin >> M >> Q;
    FOR(i,1,M){
        cin >> P[i];
        for (int j = P[i]; j < MX_P; j += P[i]) pi[j-1] = P[i]-1;
    }

    RFOR(i,MX_P-2,0) pi[i] = max(pi[i],pi[i+1]-1);
    dp[0] = 0;
    FOR(i,1,MX_P-1) {
        if (pi[i] == 0) dp[i] = infty;
        else dp[i] = dp[i-pi[i]]+1;
    }

    FOR(i,1,Q){
        int N; cin >> N;
        if (dp[N] == infty) cout << "oo" << '\n';
        else cout << dp[N] << '\n';
    }
}

• Subtask 1: 17.77777777777778 / 20
• Subtask 2: 18.88888888888889 / 20
• Subtask 3: 41.42857142857143 / 60