Submission #781488

#	Time	Username	Problem	Language	Result	Execution time	Memory
781488		OrazB	Ancient Books (IOI17_books)	C++17	12 / 100	1 ms	300 KiB

books

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <functional>
using namespace __gnu_pbds;
using namespace std;
typedef tree<int, null_type, less<int>, rb_tree_tag,
             tree_order_statistics_node_update>
    ordered_set;
//Dijkstra->set
//set.find_by_order(x) x-position value
//set.order_of_key(x) number of strictly less elements don't need *set.??
#define N 100005
#define wr cout << "Continue debugging\n";
#define all(x) (x).begin(), (x).end()
#define ll long long int
#define pii pair <int, int>
#define pb push_back
#define ff first
#define ss second
#define pv pair<pii, vector<int>>

ll mn = 1e9;
map <pv, int> mp;

// void rec(int s, int x, vector<int> p, int c){
// 	if (s < 0 or s >= p.size() or mp[{{s, x}, p}]){
// 		// mp[{{s, x}, p}] = min(mp[{{s, x}, p}], c);
// 		return;
// 	}
// 	mp[{{s, x}, p}] = c+1;
// 	rec(s+1, x, p, c+1);
// 	rec(s-1, x, p, c+1);
// 	swap(p[s], x);
// 	rec(s, x, p, c);
// 	swap(p[s], x);
// }

ll minimum_walk(vector<int> p, int s){
	int n = p.size(), pos = 0;
	ll ans = 0;
	for (int i = 0; i < n; i++){
		if (p[i] == i) continue;
		int cur = p[i];
		while(cur != i){
			ans += abs(pos-cur);
			pos = cur;
			swap(cur, p[cur]);
		}
		ans += abs(pos-i);
		pos = i;
	}
	ans += abs(pos-s);
	return min(2*n*1ll, ans);
}	
	

// int main ()
// {
// 	ios::sync_with_stdio(false);
// 	cin.tie(0);
// 	int n, s;
// 	cin >> n >> s;
// 	vector<int> p(n);
// 	for (int i = 0; i < n; i++) cin >> p[i];
// 	cout << minimum_walk(p, s);
// }	

• Subtask 1: 12 / 12
• Subtask 2: 0 / 10
• Subtask 3: 0 / 28
• Subtask 4: 0 / 20
• Subtask 5: 0 / 30