Submission #687590

#	Time	Username	Problem	Language	Result	Execution time	Memory
687590		speedyArda	K blocks (IZhO14_blocks)	C++14	0 / 100	1 ms	340 KiB

blocks

#include "bits/stdc++.h"

using namespace std;
using ll = long long;
const int MAXN = 1e5+5;
ll pref[MAXN], suf[MAXN], in[MAXN];
ll dp[105][MAXN];
ll seg[MAXN * 4];
int n, blocks;
void build(int v, int l, int r)
{
    if(l == r)
    {
        seg[v] = in[l];
        return;
    }
    int m = (l + r) / 2;

    build(2 * v, l, m);
    build(2 * v + 1, m + 1, r);
    seg[v] = max(seg[v * 2], seg[v * 2 + 1]);
}

ll get(int v, int tl, int tr, int l, int r)
{
    if(l > r)
        return 0;
    if(l == tl && tr == r)
        return seg[v];
    int tm = (tl + tr) / 2;
    return max(get(2 * v, tl, tm, l, min(tm, r)), get(2 * v + 1, tm + 1, tr, max(l, tm + 1), r));
}

void compute(int l, int r, int optl, int optr, int block)
{
    if(l > r)
        return;
    int mid = (l + r) / 2;
    pair<ll, int> best = {1e18, -1};

    for(int k = optl; k <= min(mid, optr); k++) {
        best = min(best, {(k  ? dp[block - 1][k - 1] : 0) + get(1, 0, n - 1, k, mid), k});
        //cout << k << " " << mid << " " << get(1, 0, n-1, k, mid)  << " " << best.first << "\n";
    }
    dp[block][mid] = best.first;
    int opt = best.second;
    //cout << block << " " << mid << " " << dp[block][mid] << "\n"; 
    compute(l, mid - 1, optl, opt, block);
    compute(mid + 1, r, opt, optr, block);
}

int main() 
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    cin >> n >> blocks;
    vector<int> max_idx;
    pref[0] = suf[n+1] = 0;

    for(int i = 0; i < n; i++) {
        cin >> in[i];

    }
    build(1, 0, n - 1);

    for(int i = 0; i < n; i++)
       dp[1][i] = get(1, 0, n - 1, 0, i);
    //cout << "hm\n";
    for(int block = 2; block <= blocks; block++)
    {
        compute(block - 1, n - 1, block - 1, n - 1, block);
    }

    cout << dp[blocks][n - 1] << "\n";
}

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