Submission #882081

#	Time	Username	Problem	Language	Result	Execution time	Memory
882081		nghiaaa	Building Bridges (CEOI17_building)	C++17	0 / 100	36 ms	5460 KiB

building

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define db double
#define ii pair<int,int>
#define f first
#define s second
#define mp make_pair
#define mt make_tuple
#define pb push_back
#define all(v) v.begin(),v.end()
#define BIT(i) ((ll)1<<(i))
#define endl "\n"
#define debug(x) for (auto p: x) cout<<p<<' ';cout<<endl
#define forw(i,j,z) for(int i=(int)j;i<=(int)z;i++)
#define forw2(i,j,z,k) for(int i=(int)j;i<=(int)z;i+=k)
#define ford(i,j,z) for (int i=(int)j;i>=(int)z;i--)
#define ford2(i,j,z,k) for (int i=(int)j;i>=(int)z;i-=k)
#define sz(a) (int)a.size()
const ll inf=(ll)1<<60;

int n;
const int N=1e5;
const int MAXVAL=1e6;
ll h[N+1];
ll pre[N+1],f[N+1];
struct Line{
    ll a,b;
    ll f(int x)
    {
        return (ll)a*x+b;
    }
    Line(ll a1,ll b1)
    {
        a=a1,b=b1;
    }
    Line()
    {

    }
};
Line seg[4*MAXVAL];
void add(int node,int l,int r,Line line)
{
    if (l+1==r)
    {
        if (seg[node].f(l)>line.f(l))
            seg[node]=line;
    }
    else{
        int mid=(l+r)>>1;
        if (seg[node].a>line.a||(
            seg[node].a==line.a&&seg[node].b>line.b)) swap(seg[node],line);
        if (seg[node].f(mid)<line.f(mid))
            add((node<<1)+1,l,mid,line);
        else{
            swap(seg[node],line);
            add((node<<1)+2,mid,r,line);
        }
    }
}
ll GET(int node,int l,int r,int x)
{
    if (l+1==r)
        return seg[node].f(x);
    else{
        int mid=(l+r)>>1;
        if (x<mid) return min(seg[node].f(x),GET((node<<1)+1,l,mid,x));
        else return min(seg[node].f(x),GET((node<<1)+2,mid,r,x));
    }
}
void solve()
{
    cin>>n;
    forw(i,1,n) cin>>h[i];
    forw(i,1,n){
        cin>>pre[i];
        pre[i]+=pre[i-1];
    }
    f[1]=0;
    add(0,0,MAXVAL+1,Line(-2LL*h[1],h[1]*h[1]-pre[1]));
    forw(i,2,n)
    {
        f[i]=GET(0,0,MAXVAL+1,h[i])+pre[i-1]+h[i]*h[i];
        add(0,0,MAXVAL+1,Line(-2LL*h[i],f[i]+h[i]*h[i]-pre[i]));
    }
    cout<<f[n];
}
signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    //cout<<setprecision(6)<<fixed;
    //time_t TIME_TU=clock();
    int t=1;
    //cin>>t;
    while(t--)
        solve();
    //time_t TIME_TV=clock();
    //cerr<<(db)(TIME_TV-TIME_TU)/CLOCKS_PER_SEC<<endl;
    return 0;
}

• Subtask 1: 0 / 30
• Subtask 2: 0 / 30
• Subtask 3: 0 / 40