Submission #486127

#	Time	Username	Problem	Language	Result	Execution time	Memory
486127		Duy_e	Rabbit Carrot (LMIO19_triusis)	C++14	63 / 100	1088 ms	4888 KiB

triusis

#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define pii pair<long long, long long>
#define st first
#define nd second
#define file "test"
using namespace std;
const long long oo = 1e18;
const long long N = 2e5 + 5;

ll n, m, h[N], dp[N], best[N];

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    // #ifndef ONLINE_JUDGE
    //     freopen(file".inp","r",stdin); freopen(file".out","w",stdout);
    // #endif
    
    cin >> n >> m;
    for (int i = 1; i <= n; i ++)
        cin >> h[i];

    for (int i = 0; i <= n + 1; i ++)
        dp[i] = oo, best[i] = i - 1;

    dp[0] = 0;
    for (int i = 1; i <= n + 1; i ++){
        for (int j = i - 1; j >= 0; j --)
            if (h[j] + (i - j)*m >= h[i])
                dp[i] = min(dp[i], dp[j] + i - j - 1);
        // cout << dp[i] << ' ';
    }


    cout << dp[n + 1];
    

    return 0;
}    
/**  /\_/\
    (= ._.)
    / >0  \>1 
  ________________________
 / Brainstorming section /
/=======================/
---
===
with two fixed point i, j you are allowed to change every pole between i, j
-> could it be changed so that you can go from i->j
possible case: 
+ a[j] <= a[i]
+ h[i] + (j - i)*m >= h[j]
        // upd(h[i]dp[i] - i - 1)
        // get(h[j] - j*m)

===
**/
// Before submit: spot the visible bug by reading the code. 

• Subtask 1: 14 / 14
• Subtask 2: 21 / 21
• Subtask 3: 28 / 28
• Subtask 4: 0 / 37