Submission #171739

#	Time	Username	Problem	Language	Result	Execution time	Memory
171739		VEGAnn	K blocks (IZhO14_blocks)	C++14	0 / 100	30 ms	4604 KiB

blocks

#include <bits/stdc++.h>
using namespace std;
const int oo = 2e9;
const int N = 100100;
const int K = 110;
int f[N][K], a[N], n, k;
bool bad = 0;

void calc(int j, int l, int r, int optl, int optr){
    if (l > r) return;
    int md = (l + r) >> 1;
    int mx = 0, mn = oo, ps = -1;
    for (int i = min(md, optr); i >= optl; i--){
        mx = max(mx, a[i]);
        if (f[i - 1][j - 1] < oo &&
            mn > f[i - 1][j - 1] + mx){
              mn = f[i - 1][j - 1] + mx;
              ps = i;
        }
    }
    if (mn == oo) bad = 1;
    f[md][j] = mn;
    calc(j, l, md - 1, optl, ps);
    calc(j, md + 1, r, ps, optr);
}

int main(){
    cin >> n >> k;
    for (int i = 1; i <= n; i++)
        cin >> a[i];

    for (int i = 0; i <= n; i++)
        for (int j = 0; j <= k; j++)
            f[i][j] = oo;

    f[0][0] = 0;

    for (int j = 1; j <= k; j++)
        calc(j, 1, n, 1, n);

    if (bad) return -1;

    cout << f[n][k];
    return 0;
}

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