Submission #941985

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
941985	2024-03-09T22:42:33 Z	beaboss	Ancient Books (IOI17_books)	C++14	Compilation error	0 ms	0 KB

books

// Source: https://oj.uz/problem/view/IOI17_books
// 
#include "books.h"


#include "bits/stdc++.h"

using namespace std;

#define s second
#define f first
#define pb push_back

typedef long long ll;

typedef pair<ll, ll> pii;
typedef vector<pii> vpii;

typedef vector<ll> vi;

#define FOR(i, a, b) for (ll i = (a); i<b; i++)

bool ckmin(ll& a, ll b){ return b < a ? a = b, true : false; }

bool ckmax(ll& a, ll b){ return b > a ? a = b, true : false; }

const ll N = 1e6 + 10;
ll ri[N], le[N];
bool vis[N];
vi nxt;
ll n;
ll l,r ;

void extend() {
	ll ll = nxt[l];
	while (ll < l && l > 0) {
		l--;
		ll = min(ll, nxt[l]);
	}
	ll rr = nxt[r];
	while (r < rr && r < n-1) {
		r++;
		rr = max(rr, nxt[r]);
	}
}

ll minimum_walk(vector<int> p, ll s) {
	n = p.size();
	l = r = s;
	nxt = p;
	ll ans = 0;
	FOR(i, 0, n) ans += abs(i - p[i]);

	ll st = 0;
	for (;st < n;st++) if (p[st] != st) break;
	ll en = n-1;
	for (;en >= 0;en--) if (p[en] != en) break;
	
	if (st >= en) return 0;

	while (l > st || r < en) {
		extend();
		// cout << l << r << endl;
		ll lo = l;
		ll ro = r;

		ll cr = 0;
		while (l == lo && r < en) {
			cr+=2;r++;
			// cout << 'd' << endl;
			extend();
		}
		bool rw = (nxt[r] < l);

		ll fl = l, fr=r;

		l = lo;r = ro;

		ll cl = 0;
		while (r == ro && l > st) {
			// cout << l << endl;
			cl+=2;l--;extend();
		}
		// cout << 'd' << endl;

		bool lw = (nxt[l] > r);

		l = min(l, fl);
		r = max(r, fr);

		// assert(lw ^ rw);
		if (!lw || !rw) {
			ans += cl + cr;
			break;
		}
		ans += min(cl, cr);
	}

	return ans;

}



// int main() {
// 	ios::sync_with_stdio(false);
// 	cin.tie(nullptr);

// 	// FOR(i, 0, 8) {
// 	// mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
// 	// ll n = 100;
// 	// vi here(n);
// 	// FOR(i, 0, n) here[i] = i;
// 	// shuffle(here.begin(), here.end(), rng);
// 	// FOR(i, 0, n) cout << here[i] << ' ';
// 	// cout << endl;


// 	ll res = minimum_walk({0, 2, 4, 5, 1, 6, 3}, 0);
// 	cout << res << endl;

// }

Compilation message

books.cpp: In function 'void extend()':
books.cpp:40:4: error: expected ';' before 'rr'
   40 |  ll rr = nxt[r];
      |    ^~~
      |    ;
books.cpp:40:2: warning: statement has no effect [-Wunused-value]
   40 |  ll rr = nxt[r];
      |  ^~
books.cpp:41:13: error: 'rr' was not declared in this scope; did you mean 'r'?
   41 |  while (r < rr && r < n-1) {
      |             ^~
      |             r
books.cpp: In function 'll minimum_walk(std::vector<int>, ll)':
books.cpp:50:8: error: no match for 'operator=' (operand types are 'vi' {aka 'std::vector<long long int>'} and 'std::vector<int>')
   50 |  nxt = p;
      |        ^
In file included from /usr/include/c++/10/vector:72,
                 from books.h:1,
                 from books.cpp:3:
/usr/include/c++/10/bits/vector.tcc:198:5: note: candidate: 'std::vector<_Tp, _Alloc>& std::vector<_Tp, _Alloc>::operator=(const std::vector<_Tp, _Alloc>&) [with _Tp = long long int; _Alloc = std::allocator<long long int>]'
  198 |     vector<_Tp, _Alloc>::
      |     ^~~~~~~~~~~~~~~~~~~
/usr/include/c++/10/bits/vector.tcc:199:42: note:   no known conversion for argument 1 from 'std::vector<int>' to 'const std::vector<long long int>&'
  199 |     operator=(const vector<_Tp, _Alloc>& __x)
      |               ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
In file included from /usr/include/c++/10/vector:67,
                 from books.h:1,
                 from books.cpp:3:
/usr/include/c++/10/bits/stl_vector.h:709:7: note: candidate: 'std::vector<_Tp, _Alloc>& std::vector<_Tp, _Alloc>::operator=(std::vector<_Tp, _Alloc>&&) [with _Tp = long long int; _Alloc = std::allocator<long long int>]'
  709 |       operator=(vector&& __x) noexcept(_Alloc_traits::_S_nothrow_move())
      |       ^~~~~~~~
/usr/include/c++/10/bits/stl_vector.h:709:26: note:   no known conversion for argument 1 from 'std::vector<int>' to 'std::vector<long long int>&&'
  709 |       operator=(vector&& __x) noexcept(_Alloc_traits::_S_nothrow_move())
      |                 ~~~~~~~~~^~~
/usr/include/c++/10/bits/stl_vector.h:730:7: note: candidate: 'std::vector<_Tp, _Alloc>& std::vector<_Tp, _Alloc>::operator=(std::initializer_list<_Tp>) [with _Tp = long long int; _Alloc = std::allocator<long long int>]'
  730 |       operator=(initializer_list<value_type> __l)
      |       ^~~~~~~~
/usr/include/c++/10/bits/stl_vector.h:730:46: note:   no known conversion for argument 1 from 'std::vector<int>' to 'std::initializer_list<long long int>'
  730 |       operator=(initializer_list<value_type> __l)
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~