Submission #49823

#	Time	Username	Problem	Language	Result	Execution time	Memory
49823		mra2322001	K blocks (IZhO14_blocks)	C++14	0 / 100	42 ms	37268 KiB

blocks

#include <bits/stdc++.h>
#define f0(i, n) for(int i=(0); i<n; i++)
#define f1(i, n) for(int i=(1); i<=n; i++)

using namespace std;
typedef long long ll;
const int N = 100002;

int n, a[N], k;
ll f[N][102];

main(){
    ios_base::sync_with_stdio(0);

    cin >> n >> k;
    stack <int> s;
    f1(i, n){
        cin >> a[i];
        while(s.size() && a[s.top()] <= a[i]) s.pop();
        f1(j, k){
            if(i >= j){
                if(s.size()==0) f[i][j] = f[j - 1][j - 1] + a[i];
                else{
                    if(s.top() >= j - 1) f[i][j] = f[s.top()][j - 1] + a[i];
                    else f[i][j] = f[j - 1][j - 1] + a[i];
                }
            }
        }
        s.push(i);
    }
    ll res = 1e17;
    ll ma = a[n];
    for(int j = n - 1; j >= k - 1; j--){
        res = min(res, f[j][k - 1] + ma);
        ma = max(ma, ll(a[j]));
    }
    cout << res;
}

Compilation message (stderr)

blocks.cpp:12:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^

• Subtask 1: 0 / 14
• Subtask 2: 0 / 18
• Subtask 3: 0 / 21
• Subtask 4: 0 / 47