Submission #991922

#	Time	Username	Problem	Language	Result	Execution time	Memory
991922		overwatch9	Safety (NOI18_safety)	C++17	4 / 100	2058 ms	262144 KiB

safety

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
using ll = long long;
int n, h;
vector <ll> s;
vector <vector <ll>> dp;
ll solve(int i, int prev) {
    if (i > n)
        return 0;
    if (dp[i][prev] != -1)
        return dp[i][prev];
    ll ans = 1e10;
    for (int j = max(0, prev - h); j <= min(prev + h, 800); j++)
        ans = min(ans, solve(i+1, j) + abs(j - s[i]));
    dp[i][prev] = ans;
    return ans;
}
int main()
{
    cin >> n >> h;
    s = vector <ll> (n+1);
    for (int i = 1; i <= n; i++)
        cin >> s[i];
    int maxs = *max_element(s.begin(), s.end());
    dp = vector <vector <ll>> (n+1, vector <ll> (800 + 1, -1));
    ll ans = 1e10;
    for (int i = 0; i <= 800; i++) {
        dp = vector <vector <ll>> (n+1, vector <ll> (800 + 1, -1));
        ans = min(ans, solve(1, i));
    }
    cout << ans << '\n';
}

Compilation message (stderr)

safety.cpp: In function 'int main()':
safety.cpp:26:9: warning: unused variable 'maxs' [-Wunused-variable]
   26 |     int maxs = *max_element(s.begin(), s.end());
      |         ^~~~

• Subtask 1: 0 / 3
• Subtask 2: 4 / 4
• Subtask 3: 0 / 9
• Subtask 4: 0 / 5
• Subtask 5: 0 / 6
• Subtask 6: 0 / 11
• Subtask 7: 0 / 11
• Subtask 8: 0 / 22
• Subtask 9: 0 / 29