Submission #355117

#	Time	Username	Problem	Language	Result	Execution time	Memory
355117		kylych03	Ancient Books (IOI17_books)	C++14	50 / 100	195 ms	16088 KiB

books

#include "books.h"
//#include "grader.cpp"
#include <bits/stdc++.h>
#define ll long long
using namespace std;
int vis[1000001];
long long minimum_walk(std::vector<int> p, int s) {
	ll ans=0;
	vector <pair<ll, ll>> vec;
	for(int i = 0 ; i < p.size(); i++){
		ans+= abs( i - p[i]);
		int j = i;
		int l = i , r = i;
		while(vis[j]==0){
			l=min(l,j);
			r = max(r,j);
			vis[j]=1;
			j = p[j];
		}
		if(l!=r)
			vec.push_back(make_pair(l,r));
	}
	vec.push_back(make_pair(s,s));
	//cout << vec.size()<<endl;
	sort( vec.begin(), vec.end() );
	for(int i = 1; i < vec.size();i++){
		ans += (2 * max(0ll, vec[i].first - vec[i-1].second));
		vec[i].second = max(vec[i].second, vec[i-1].second);
	}
	return ans;
}

Compilation message (stderr)

books.cpp: In function 'long long int minimum_walk(std::vector<int>, int)':
books.cpp:10:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |  for(int i = 0 ; i < p.size(); i++){
      |                  ~~^~~~~~~~~~
books.cpp:26:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |  for(int i = 1; i < vec.size();i++){
      |                 ~~^~~~~~~~~~~~

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