제출 #340983

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
340983		pggp	Ancient Books (IOI17_books)	C++14	0 / 100	1 ms	364 KiB

books

#include <bits/stdc++.h>

using namespace std;

bool used[1000000];
vector < int > P;
int N;
int cur_cycle;
int cycle[1000000];
vector < vector < int > > cycs;
vector < int > l_cyc, r_cyc;

void dfs(int vertex){
	cycle[vertex] = cur_cycle;
	cycs[cur_cycle].push_back(vertex);
	used[vertex] = true;
	if(!used[P[vertex]]){
		dfs(P[vertex]);
	}
}

long long minimum_walk(vector < int > p, int s){
	N = p.size();
	P = p;
	cur_cycle = 0;
	for (int i = 0; i < N; ++i)
	{
		if(!used[i]){
			vector < int > v;
			cycs.push_back(v);
			dfs(i);
			cur_cycle++;
		}
	}

	vector < pair < int, int > > f;

	for (int i = 0; i < cycs.size(); ++i)
	{
		int l_cyc = 1000000;
		int r_cyc = 0;
		for(int v : cycs[i]){
			l_cyc = min(l_cyc, v);
			r_cyc = max(r_cyc, v);
		}
		f.push_back(make_pair(l_cyc, r_cyc));
	}


	sort(f.begin(), f.end());

	long long ans = 0;

	for (int i = 0; i < f.size(); ++i)
	{
		//cout << f[i].first << " " << f[i].second << endl;
		ans += 2 * (f[i].second - f[i].first);
	}
	ans += f.size();
	return ans;
}

컴파일 시 표준 에러 (stderr) 메시지

books.cpp: In function 'long long int minimum_walk(std::vector<int>, int)':
books.cpp:38:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |  for (int i = 0; i < cycs.size(); ++i)
      |                  ~~^~~~~~~~~~~~~
books.cpp:54:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |  for (int i = 0; i < f.size(); ++i)
      |                  ~~^~~~~~~~~~

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