Submission #885111

#	Time	Username	Problem	Language	Result	Execution time	Memory
885111		votranngocvy	K blocks (IZhO14_blocks)	C++14	0 / 100	1 ms	2648 KiB

blocks

#include <bits/stdc++.h>
using namespace std;

#define int long long
const int N = 1e5 + 5;
const int inf = 0x3f3f3f3f3f3f3f3f;
int a[N],st[4 * N],n,k,dp[N][105];

void build(int id,int l,int r) {
    if (l == r) {
        st[id] = a[l];
        return;
    }
    int mid = (l + r) / 2;
    build(id * 2,l,mid);
    build(id * 2 + 1,mid + 1,r);
    st[id] = max(st[id * 2],st[id * 2 + 1]);
}

int get(int id,int l,int r,int u,int v) {
    if (v < l || r < u) return -inf;
    if (u <= l && r <= v) return st[id];
    int mid = (l + r) / 2;
    return max(get(id * 2,l,mid,u,v),get(id * 2 + 1,mid + 1,r,u,v));
}

void compute(int idx,int l,int r,int optl,int optr) {
    if (l > r) return;
    int mid = (l + r) / 2;
    int best = inf,opt = -1;
    for (int i = optl; i <= min(optr,mid); i++) {
        int tmp = dp[idx - 1][i - 1] + get(1,1,n,i,mid);
        if (tmp < best) best = tmp,opt = i;
    }
    dp[idx][mid] = best;
    compute(idx,l,mid - 1,optl,opt);
    compute(idx,mid + 1,r,opt,optr);
}

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    cin >> n >> k;
    for (int i = 1; i <= n; i++) cin >> a[i];
    build(1,1,n);
    for (int i = 0; i <= k; i++)
        for (int j = 0; j <= n; j++) dp[i][j] = inf;
    dp[0][0] = 0;
    for (int i = 1; i <= n; i++) dp[1][i] = get(1,1,n,1,i);
    for (int i = 2; i <= k; i++) compute(i,1,n,1,n);
    cout << dp[k][n] << "\n";
}

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