Submission #155866

#	Time	Username	Problem	Language	Result	Execution time	Memory
155866		HellAngel	Brunhilda’s Birthday (BOI13_brunhilda)	C++14	97.78 / 100	986 ms	253484 KiB

brunhilda

#include <bits/stdc++.h>
#define int long long

using namespace std;
const int maxn = 1e5 + 7;
const int maxans = 1e7 + 6e6;
int m, q, p[maxn], last[maxans], dp[maxans];

int32_t main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    if(fopen("test.inp", "r")) freopen("test.inp", "r", stdin), freopen("test.out", "w", stdout);
    cin >> m >> q;
    for(int i = 1; i <= m; i++)
    {
        cin >> p[i];
        for(int j = p[i] - 1; j < maxans; j += p[i])
        {
            last[j] = p[i] - 1;
        }
    }
    for(int i = maxans - 2; i >= 0; i--)
    {
        last[i] = max(last[i], last[i + 1] - 1);
    }
    for(int i = 1; i < maxans; i++)
    {
        if(last[i] != 0)
        dp[i] = dp[i - last[i]] + 1;
    }
    for(int i = 1; i <= q; i++)
    {
        int x;
        cin >> x;
        if(dp[x] == 0) cout << "oo" << '\n';
        else cout << dp[x] << '\n';
    }
}

Compilation message (stderr)

brunhilda.cpp: In function 'int32_t main()':
brunhilda.cpp:13:63: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     if(fopen("test.inp", "r")) freopen("test.inp", "r", stdin), freopen("test.out", "w", stdout);
                                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
brunhilda.cpp:13:63: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]

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