oj.uz

Submission #252056

# Submission time Handle Problem Language Result Execution time Memory
252056 2020-07-24T04:45:24 Z errorgorn Building Bridges (CEOI17_building) C++14
100 / 100
 257 ms 128376 KB 
//雪花飄飄北風嘯嘯
//天地一片蒼茫

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/rope>
using namespace std;
using namespace __gnu_pbds;
using namespace __gnu_cxx;
#define ll long long
#define ii pair<ll,ll>
#define iii pair<ii,ll>
#define fi first
#define se second
#define endl '\n'
#define debug(x) cout << #x << " is " << x << endl;

#define rep(x,start,end) for(auto x=(start)-((start)>(end));x!=(end)-((start)>(end));((start)<(end)?x++:x--))
#define all(x) (x).begin(),(x).end()
#define sz(x) (int)(x).size()

ll MAX(ll a){return a;}
ll MIN(ll a){return a;}
template<typename... Args>
ll MAX(ll a,Args... args){return max(a,MAX(args...));}
template<typename... Args>
ll MIN(ll a,Args... args){return min(a,MIN(args...));}

#define indexed_set tree<ll,null_type,less<ll>,rb_tree_tag,tree_order_statistics_node_update>

mt19937 rng(chrono::system_clock::now().time_since_epoch().count());

struct line{
	ll m,c;
	
	line (ll _m,ll _c){
		m=_m,c=_c;
	}
	
	ll get(ll x){
		return m*x+c;
	}
};

struct node{
	int s,e,m; //[s,e)
	line val=line(0,1e19);
	node *l,*r;
	
	node (int _s,int _e){
		s=_s,e=_e,m=s+e>>1;
		
		if (e-s>1){
			l=new node(s,m);
			r=new node(m,e);
		}
	}
	
	void update(line i){
		bool left=i.get(s)<val.get(s);
		bool mid=i.get(m)<val.get(m);
		
		if (mid) swap(i,val);
		
		if (e-s>1){
			if (left!=mid) l->update(i);
			else r->update(i);
		}
	}
	
	ll query(ll x){
		if (e-s==1) return val.get(x);
		else if (x<m) return min(l->query(x),val.get(x));
		else return min(r->query(x),val.get(x));
	}
} *root=new node(0,1000005);

ll sq(ll i){
	return i*i;
}

int n;
ll h[100005];
ll w[100005]; //actually pref

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	
	cin>>n;
	rep(x,1,n+1) cin>>h[x];
	rep(x,1,n+1){
		cin>>w[x];
		w[x]+=w[x-1];
	}
	
	root->update(line(-2*h[1],sq(h[1])-w[1]));
	
	ll ans;
	rep(x,2,n+1){
		ans=root->query(h[x])+sq(h[x])+w[x-1];
		//cout<<ans<<endl;
		root->update(line(-2*h[x],sq(h[x])-w[x]+ans));
	}
	
	cout<<ans<<endl;
}

Compilation message

building.cpp:48:22: warning: overflow in implicit constant conversion [-Woverflow]
  line val=line(0,1e19);
                      ^
building.cpp: In constructor 'node::node(int, int)':
building.cpp:52:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   s=_s,e=_e,m=s+e>>1;
               ~^~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 107 ms 125560 KB Output is correct
2 Correct 103 ms 125688 KB Output is correct
3 Correct 103 ms 125560 KB Output is correct
4 Correct 105 ms 125560 KB Output is correct
5 Correct 116 ms 125560 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 163 ms 127352 KB Output is correct
2 Correct 164 ms 127096 KB Output is correct
3 Correct 173 ms 127096 KB Output is correct
4 Correct 155 ms 127224 KB Output is correct
5 Correct 160 ms 127096 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 107 ms 125560 KB Output is correct
2 Correct 103 ms 125688 KB Output is correct
3 Correct 103 ms 125560 KB Output is correct
4 Correct 105 ms 125560 KB Output is correct
5 Correct 116 ms 125560 KB Output is correct
6 Correct 163 ms 127352 KB Output is correct
7 Correct 164 ms 127096 KB Output is correct
8 Correct 173 ms 127096 KB Output is correct
9 Correct 155 ms 127224 KB Output is correct
10 Correct 160 ms 127096 KB Output is correct
11 Correct 257 ms 127144 KB Output is correct
12 Correct 206 ms 127096 KB Output is correct
13 Correct 168 ms 127096 KB Output is correct
14 Correct 250 ms 127224 KB Output is correct
15 Correct 162 ms 127096 KB Output is correct
16 Correct 165 ms 128120 KB Output is correct
17 Correct 147 ms 128376 KB Output is correct
18 Correct 159 ms 128248 KB Output is correct