Submission #684105

#	Time	Username	Problem	Language	Result	Execution time	Memory
684105		Dulguun	Arranging Shoes (IOI19_shoes)	C++14	10 / 100	1 ms	340 KiB

shoes

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

long long count_swaps(vector<int> s){
	map<int, vector<int> > m;
	int l=s.size(), n=(s.size()+1)/2;
	long long sum=0;
	for(int i=0; i<l; i++){
		m[s[i]].push_back(i);
	}
	for(int i=0; i<l; i++){
		if(s[i]==0) continue;
		sum+=m[-s[i]][0]-i-1;
		if(s[i]>0) sum++;
		s[m[-s[i]][0]]=0;
		m[-s[i]].erase(m[-s[i]].begin());
	}
	return sum;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:6:18: warning: unused variable 'n' [-Wunused-variable]
    6 |  int l=s.size(), n=(s.size()+1)/2;
      |                  ^

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