Submission #113895

#	Time	Username	Problem	Language	Result	Execution time	Memory
113895		ckodser	Building Bridges (CEOI17_building)	C++14	30 / 100	3029 ms	6632 KiB

building

#include<bits/stdc++.h>

#define ll long long
#define pb push_back
#define mp make_pair
#define ld long double
#define F first
#define S second
#define pii pair<ll,ll> 

using namespace :: std;

const ll mod=1e9+7;
const ll maxn=1e5+500;
const ll inf=1e18+900;


vector<pii> vec;


ll kojas(ll a,ll t){
    return vec[a].F+vec[a].S*t;
}
ll kojas(pii e,ll t){
    return e.F+e.S*t;
}
void addLine(ll x,ll v){
    vec.pb(mp(x,v));
}
ll find_min_aT(ll t){
    ll ans=inf;
    for(auto e:vec){
	ans=min(ans,kojas(e,t));
    }
    return ans;
}

ll h[maxn];
ll w[maxn];
ll c[maxn];
ll dp[maxn];

int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    ll n,s=0;
    cin>>n;
    for(ll i=0;i<n;i++){
	cin>>h[i];
    }
    for(ll i=0;i<n;i++){
	cin>>w[i];
	s+=w[i];
    }
    for(ll i=0;i<n;i++){
	c[i]=-w[i]+h[i]*h[i];
	if(0<i && i<n-1){
	    c[i]+=h[i]*h[i];
	}
    }
    dp[0]=c[0];
    addLine(dp[0],-2*h[0]);
    for(ll i=1;i<n;i++){
	dp[i]=find_min_aT(h[i])+c[i];
	addLine(dp[i],-2*h[i]);
    }
    cout<<dp[n-1]+s;
}

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