Submission #1096367

#	Time	Username	Problem	Language	Result	Execution time	Memory
1096367		VMaksimoski008	Sparklers (JOI17_sparklers)	C++17	50 / 100	34 ms	18256 KiB

sparklers

#include <bits/stdc++.h>

#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define int long long

using namespace std;

using ll = long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;

const int mod = 1e9 + 7;
const int LOG = 20;
const int maxn = 1e5 + 5;

int dp[1005][1005];

signed main() {
    int n, id, t, l=0, r=1e9, ans=1e9; cin >> n >> id >> t;

    vector<ll> v(n+1);
    for(int i=1; i<=n; i++) cin >> v[i];
    r = ans = v[n] / t + 1;
    while(l <= r) {
        int mid = (l + r) / 2;
        memset(dp, 0, sizeof(dp));
        dp[id][id] = 1;
        for(int len=2; len<=n; len++)
            for(int i=1, j=len; j<=n; i++,j++)
                if(v[j] - v[i] <= 2ll * mid * (j - i) * t) dp[i][j] = (dp[i+1][j] || dp[i][j-1]);
        if(dp[1][n]) ans = mid, r = mid - 1;
        else l = mid + 1;
    }

    cout << ans << '\n';
    return 0;
}

• Subtask 1: 30 / 30
• Subtask 2: 20 / 20
• Subtask 3: 0 / 50