Submission #757439

#	Time	Username	Problem	Language	Result	Execution time	Memory
757439		dxz05	Brunhilda’s Birthday (BOI13_brunhilda)	C++17	100 / 100	341 ms	79844 KiB

brunhilda

#pragma GCC optimize("Ofast,O3,unroll-loops")
#pragma GCC target("avx2")

#include <bits/stdc++.h>

using namespace std;

#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define bpc(x) __builtin_popcount(x)
#define bpcll(x) __builtin_popcountll(x)
#define MP make_pair
//#define endl '\n'

mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());

typedef long long ll;
const int MOD = 1e9 + 7;
const int N = 1e7 + 2;

int dp[N];
int max_p[N];

void solve(){
    int m, q;
    cin >> m >> q;

    vector<int> primes(m);
    for (int i = 0; i < m; i++) cin >> primes[i];

    for (int p : primes){
        for (int i = 0; i < N; i += p) max_p[i] = p;
    }

    fill(dp + 1, dp + N, 1e9);

    int l = 0, r = 0;
    int val = 0;

    while (r < N){
        if (l > r) break;

        int nxt_r = r;
        for (int i = l; i <= r; i++){
            dp[i] = val;

            int p = max_p[i];
            if (p == 0) continue;
            nxt_r = max(nxt_r, i + p - 1);
        }

        nxt_r = min(nxt_r, N - 1);
        l = r + 1;
        r = nxt_r;
        val++;
    }

    while (q--){
        int i;
        cin >> i;
        if (dp[i] != 1e9){
            cout << dp[i] << "\n";
        } else {
            cout << "oo\n";
        }
    }

}

int main(){
    clock_t startTime = clock();
    ios_base::sync_with_stdio(false);

#ifdef LOCAL
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif

    int test_cases = 1;
//    cin >> test_cases;

    for (int test = 1; test <= test_cases; test++){
        // cout << (solve() ? "YES" : "NO") << endl;
        solve();
    }

#ifdef LOCAL
    cerr << "Time: " << int((double) (clock() - startTime) / CLOCKS_PER_SEC * 1000) << " ms" << endl;
#endif

    return 0;
}

Compilation message (stderr)

brunhilda.cpp: In function 'int main()':
brunhilda.cpp:71:13: warning: unused variable 'startTime' [-Wunused-variable]
   71 |     clock_t startTime = clock();
      |             ^~~~~~~~~

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