Submission #598190

#	Time	Username	Problem	Language	Result	Execution time	Memory
598190		yanndev	Ancient Books (IOI17_books)	C++17	0 / 100	2090 ms	340 KiB

books

#include <bits/stdc++.h>
#define ll long long
using namespace std;

ll minimum_walk(vector<int> p, int s) {
    ll ans = 1e9;
    int n = (int)p.size();
    vector<vector<int>> cycles {};
    vector<bool> vis (n, false);
    int last = 0;
    for (int i = 0; i < n; i++) {
        if (vis[i])
            continue;
        
        //ans += abs(i - last);
        int pos = i;
        last = i;
        cycles.push_back({});
        while (!vis[pos]) {
            vis[pos] = true;
            cycles.back().push_back(pos);
            //ans += abs(p[pos] - pos);
            pos = p[pos];
        }
    }

    //ans += last;
	vector<int> perm {};
	for (int i = 0; i < (int)cycles.size(); i++)
		perm.push_back(i);
	do {
		ll sub = 0;
		int lst = 0;
		for (int i = 0; i < (int)cycles.size(); i++) {
			for (auto& x: cycles[i]) {
				sub += abs(x - lst);
				lst = x;
			}
		}
		sub += lst;
		ans = min(ans, sub);
	} while (next_permutation(perm.begin(), perm.end()));
    return ans;
}

Compilation message (stderr)

books.cpp: In function 'long long int minimum_walk(std::vector<int>, int)':
books.cpp:10:9: warning: variable 'last' set but not used [-Wunused-but-set-variable]
   10 |     int last = 0;
      |         ^~~~

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