Submission #976521

#	Time	Username	Problem	Language	Result	Execution time	Memory
976521		GrindMachine	Wiring (IOI17_wiring)	C++17	100 / 100	104 ms	20508 KiB

wiring

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) (int)a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x,y) ((x+y-1)/(y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i,n) for(int i = 0; i < n; ++i)
#define rep1(i,n) for(int i = 1; i <= n; ++i)
#define rev(i,s,e) for(int i = s; i >= e; --i)
#define trav(i,a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a,b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a,b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*

refs;
https://cubelover.tistory.com/8

*/

const int MOD = 1e9 + 7;
const int N = 1e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

#include "wiring.h"

long long min_total_length(std::vector<int> a, std::vector<int> b) {
	ll n = sz(a), m = sz(b);
	sort(all(a)), sort(all(b));

	vector<array<ll,3>> c;
	
	rep(i,n){
		ll x = a[i];
		auto it = lower_bound(all(b),x);
		ll bef = -inf2, aft = inf2;
		if(it != b.end()) aft = *it;
		if(it != b.begin()) bef = *prev(it);
		ll mn_dis = min(abs(x-bef),abs(x-aft));
		c.pb({x,mn_dis,1}); 		
	}

	rep(i,m){
		ll x = b[i];
		auto it = lower_bound(all(a),x);
		ll bef = -inf2, aft = inf2;
		if(it != a.end()) aft = *it;
		if(it != a.begin()) bef = *prev(it);
		ll mn_dis = min(abs(x-bef),abs(x-aft));
		c.pb({x,mn_dis,2});
	}
	
	sort(all(c));
	ll siz = sz(c);
	c.insert(c.begin(),{0,0});

	vector<ll> p(siz+5), pref(siz+5);
	rep1(i,siz){
		p[i] = p[i-1], pref[i] = pref[i-1];
		if(c[i][2] == 1) p[i]++, pref[i] += c[i][0];
		else p[i]--, pref[i] -= c[i][0];
	}

	vector<ll> dp(siz+5,inf2);
	map<ll,ll> mp;
	dp[0] = 0;
	mp[0] = 0;
	
	rep1(i,siz){
		dp[i] = dp[i-1]+c[i][1];
		if(mp.count(p[i])){
			ll j = mp[p[i]];
			ll diff = pref[i]-pref[j];
			amin(dp[i],dp[j]+abs(diff));
		}

		mp[p[i]] = i;
	}

	return dp[siz]; 
}

• Subtask 1: 7 / 7
• Subtask 2: 13 / 13
• Subtask 3: 10 / 10
• Subtask 4: 25 / 25
• Subtask 5: 45 / 45