Submission #782254

#	Time	Username	Problem	Language	Result	Execution time	Memory
782254		ikaurov	Ancient Books (IOI17_books)	C++17	Compilation error	0 ms	0 KiB

books

long long minimum_walk(std::vector<int> p, int s) {
	int n = sz(p);
  ll ans = 0;
  vector<int> x{0}, sx{0}, sumsz{0};
  for (int i = 0; i < n; i++){
    ans += abs(i - p[i]);
  }
  for (int i = 0, mx = -1; i < n;){
    if (i == p[i] && mx < i){
      int j = i;
      while (j < n && j == p[j]) j++;
      if (j == n) break;
      x.pb(j - i);
      sx.pb(sx.back() + x.back());
      sumsz.pb(j);
      i = j;
    }
    else mx = max(mx, p[i]), i++;
  }
  x.pb(0);
  sx.pb(sx.back());
  sumsz.pb(sumsz.back());
  int m = sz(x);
  vector<ll> dp(m);
  ll minval = 0;
  for (int i = 1; i < m; i++){
    dp[i] = minval + sx[i - 1] * 2 + sumsz[i] + x[i];
    minval = min(minval, dp[i] - 2 * sx[i] - sumsz[i]);
  }
  return ans + dp.back();
}

Compilation message (stderr)

books.cpp:1:29: error: 'vector' is not a member of 'std'
    1 | long long minimum_walk(std::vector<int> p, int s) {
      |                             ^~~~~~
books.cpp:1:1: note: 'std::vector' is defined in header '<vector>'; did you forget to '#include <vector>'?
  +++ |+#include <vector>
    1 | long long minimum_walk(std::vector<int> p, int s) {
books.cpp:1:36: error: expected primary-expression before 'int'
    1 | long long minimum_walk(std::vector<int> p, int s) {
      |                                    ^~~
books.cpp:1:44: error: expected primary-expression before 'int'
    1 | long long minimum_walk(std::vector<int> p, int s) {
      |                                            ^~~
books.cpp:1:49: error: expression list treated as compound expression in initializer [-fpermissive]
    1 | long long minimum_walk(std::vector<int> p, int s) {
      |                                                 ^