Submission #775816

#	Time	Username	Problem	Language	Result	Execution time	Memory
775816		Jomnoi	Ancient Books (IOI17_books)	C++17	50 / 100	95 ms	18808 KiB

books

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

const int MAX_N = 1e6 + 5;

int qs[MAX_N];

long long minimum_walk(vector <int> p, int s) {
	for (int i = 0; i < p.size(); i++) {
		qs[min(i, p[i])]++;
		qs[max(i, p[i])]--;
	}

	long long ans = 0;
	int sum = 0, cnt = 0;
	for (int i = 0; i < p.size(); i++) {
		sum += qs[i];
		ans += sum;
		if (sum == 0) cnt++;
		else ans += 2 * cnt, cnt = 0;
	}
	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:17:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |  for (int i = 0; i < p.size(); i++) {
      |                  ~~^~~~~~~~~~

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