Submission #251982

#	Time	Username	Problem	Language	Result	Execution time	Memory
251982		abacaba	Brunhilda’s Birthday (BOI13_brunhilda)	C++14	100 / 100	798 ms	158056 KiB

brunhilda

#include <bits/stdc++.h>
using namespace std;
 
template <typename T> void Min(T &a, T b) {
    a = min(a, b);
}
 
template <typename T> void Max(T &a, T b) {
    a = max(a, b);
}

const int mod = 1e9 + 7;
const int inf = 0x3f3f3f3f;
const int N = 2e7 + 15;
int m, q, mx[N], dp[N];

main() {
    memset(dp, 0x3f, sizeof(dp));
    ios_base::sync_with_stdio(0); cout.tie(0); cin.tie(0);
    cin >> m >> q;
    while(m--) {
        int p;
        cin >> p;
        for(int i = p - 1; i < N; i += p)
            Max(mx[i], p - 1);
    }
    for(int i = N - 2; i; --i)
        Max(mx[i], mx[i + 1] - 1);
    dp[0] = 0;
    for(int i = 1; i < N; ++i)
        Min(dp[i], dp[i - mx[i]] + 1);
    while(q--) {
        int x;
        cin >> x;
        if(dp[x] == inf)
            cout << "oo" << endl;
        else
            cout << dp[x] << endl;
    }
    return 0;
}

Compilation message (stderr)

brunhilda.cpp:17:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main() {
      ^

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