Submission #730902

#	Time	Username	Problem	Language	Result	Execution time	Memory
730902		Hemister	K blocks (IZhO14_blocks)	C++14	0 / 100	1 ms	340 KiB

blocks

#include <bits/stdc++.h>
#define f first
#define s second
#define pb push_back
#define mp make_pair
#define ll long long
#define ldb long double
#define in(x) freopen(x,"r",stdin)
#define out(x) freopen(x,"w",stdout)
#define fo(i,l,r) for(int i=(l);i<=(r);i++)
#define foi(i,l,r) for(int i=(l);i>=(r);i--)
#define el cout<<'\n';
#define all(x) x.begin(),x.end()
#define ii pair<int,int>
#define iii pair<int,ii>
#define gb(x,i) (((x)>>(i))&1)
#define mask(i) (1LL<<(i))
using namespace std;
const int N=1e5+5;
const int bl=450;
const ll base=1e9+7;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
ll Rand(ll l,ll r)
{
    return l+(1ll*rng()*rng()%(r-l+1)+(r-l+1))%(r-l+1);
}
template<class X,class Y>bool maximize(X &a,Y b)
{
    if(a<b) return a=b,true;
    return false;
}
template<class X,class Y>bool minimize(X &a, Y b)
{
    if(a>b) return a=b,true;
    return false;
}
void add(ll &a,ll b)
{
    a+=b;
    if(a>=base) a-=base;
    if(a<0) a+=base;
}
int n,k,h[N],now,vt;
stack<int>ss;
ll dp[N],g[N],st[4*N],del[4*N];
void push(int id)
{
    fo(i,id<<1,id<<1|1) st[i]+=del[id],del[i]+=del[id];
    del[id]=0;
}
void update(int id,int l,int r,int u,int v,int val)
{
    if(l>v||r<u||l>r) return;
    if(u<=l&&r<=v)
    {
        st[id]+=val,del[id]+=val;
        return;
    }
    push(id);
    int mid=(l+r)>>1;
    update(id<<1,l,mid,u,v,val),update(id<<1|1,mid+1,r,u,v,val);
    st[id]=min(st[id<<1],st[id<<1|1]);
}
ll get(int id,int l,int r,int u,int v)
{
    if(l>v||r<u||l>r) return 1e18;
    if(u<=l&&r<=v) return st[id];
    int mid=(l+r)>>1;
    push(id);
    return min(get(id<<1,l,mid,u,v),get(id<<1|1,mid+1,r,u,v));
}
void build(int id,int l,int r)
{
    if(l>r) return;
    if(l==r)
    {
        st[id]=del[id]=0;
        return;
    }
    int mid=(l+r)>>1;
    build(id<<1,l,mid),build(id<<1|1,mid+1,r);
}
int main()
{
    //in("o.inp");
    //out("o.out");
    srand(time(NULL));
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin>>n>>k;
    fo(i,1,n) cin>>h[i];
    fo(i,1,n) dp[i]=max(dp[i-1],1LL*h[i]);
    fo(x,2,k)
    {
        build(1,1,n);
        while(ss.size()) ss.pop();
        fo(i,1,n) g[i]=1e18;
        fo(i,x,n)
        {
            update(1,1,n,i,i,dp[i-1]+h[i]);
            now=i-1;
            while(ss.size()&&h[ss.top()]<=h[i])
            {
                ss.pop();
                if(ss.size()==0) vt=x;
                else vt=ss.top()+1;
                update(1,1,n,vt,now,h[i]-h[now]);
                now=vt-1;
            }
            ss.push(i),g[i]=get(1,1,n,x,i);
        }
        fo(i,1,n) dp[i]=g[i];
    }
    cout<<dp[n];
}

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