Submission #968244

#	Time	Username	Problem	Language	Result	Execution time	Memory
968244		nguyentunglam	Ancient Books (IOI17_books)	C++17	0 / 100	1 ms	348 KiB

books

#include "books.h"
#include<bits/stdc++.h>
using namespace std;


long long minimum_walk(std::vector<int> p, int s) {
  int n = p.size();
  vector<int> vis(n);
  int last = 0;
  long long ans = 0;
  for(int i = 0; i < n; i++) if (!vis[i]) {
    last = i;
    int cur = i;
    vis[cur] = 0;
    int pre = cur;
    cur = p[cur];
    while (!vis[cur]) {
      vis[cur] = 1;
      ans += abs(pre - cur);
      pre = cur;
      cur = p[cur];
    }
  }
  ans += last * 2;
	return ans;
}

#ifdef ngu

int main() {
  freopen ("task.inp", "r", stdin);
  freopen ("task.out", "w", stdout);
	int n, s;
	assert(2 == scanf("%d %d", &n, &s));

	vector<int> p((unsigned) n);
	for(int i = 0; i < n; i++)
		assert(1 == scanf("%d", &p[(unsigned) i]));

	long long res = minimum_walk(p, s);
	printf("%lld\n", res);

	return 0;
}
#endif // ngu

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