Submission #601670

#	Time	Username	Problem	Language	Result	Execution time	Memory
601670		chirathnirodha	Arranging Shoes (IOI19_shoes)	C++17	50 / 100	1080 ms	1876 KiB

shoes

#include "shoes.h"
#include<bits/stdc++.h>
using namespace std;
#define MP make_pair
#define PB push_back

long long count_swaps(vector<int> s){
	int ans=0;
	int n=s.size()/2;
	for(int i=0;i<2*n;i+=2){
		if(s[i]<0 && s[i]==-s[i+1])continue;
		int pos;
		for(int j=i+1;j<2*n;j++){
			if(s[i]==-s[j]){pos=j;break;}
		}
		for(int j=pos;j>i+1;j--){
			swap(s[j],s[j-1]);
			ans++;
		}
		if(s[i]<0)continue;
		swap(s[i],s[i+1]);
		ans++;
	}
	return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:17:12: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized]
   17 |    swap(s[j],s[j-1]);
      |            ^

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