Submission #1047250

#	Time	Username	Problem	Language	Result	Execution time	Memory
1047250		vjudge1	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	0 ms	348 KiB

shoes

#include "shoes.h"
#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define pb push_back

long long count_swaps(std::vector<int> s) {
	int n = s.size() + 5;
	vector<deque<int>> pos(n + n);
	ll ans = 0;
	for(int i = 0; i < s.size(); ++i){
		if(s[i] < 0){
			if(pos[-s[i] + n].empty()){
				pos[-s[i]].pb(i);
			}else{
				ans += i - pos[-s[i] + n].front();
				pos[-s[i] + n].pop_front();
			}
		}else{
			if(pos[s[i]].empty()){
				pos[s[i] + n].pb(i);
			}else{
				ans += i - 1 - pos[s[i]].front();
				pos[s[i]].pop_front();
			}
		}
		// cout << ans << ' ';
	}

	return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:11:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   11 |  for(int i = 0; i < s.size(); ++i){
      |                 ~~^~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 15